Strain Name:

C57BL/6ByJ

Stock Number:

001139

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Common Names: C57 Bailey;     B6By;     Black 6 Bailey;    
This C57BL/6ByJ substrain, closely related to C57BL/6NJ, does not contain the nicotinamide nucleotide transhydrogenase (Nnt) gene deletion found in C57BL/6J.

Description

Strain Information

Former Names B6    (Changed: 15-DEC-04 )
B6 Bailey    (Changed: 15-DEC-04 )
B6 Bailey J    (Changed: 15-DEC-04 )
Type Inbred Strain;
Additional information on Inbred Strains.
Visit our online Nomenclature tutorial.
Mating SystemSibling x Sibling         (Female x Male)   01-MAR-06
Specieslaboratory mouse
H2 Haplotypeb
GenerationF200+F14 (11-DEC-13)
Generation Definitions

Appearance
black
Related Genotype: a/a

Description
5 SNP differences have been identified that distinguish C57BL/6J from C57BL/6ByJ and C57BL/6NJ. Both C57BL/6ByJ and C57BL/6NJ type as follows: 08-015199792-M is C; 11-004367508-M is A; 13-041017317-M is C; 15-057561875-M is G; 19-049914266-M is T. C57BL/6J types as follows: 08-015199792-M is T; 11-004367508-M is G; 13-041017317-M is T; 15-057561875-M is A; 19-049914266-M is G (Petkov and Wiles, 2005.)

Development
In 1951 C57BL/6J, then at generation F32, was sent from The Jackson Laboratory to The National Institute of Health where they were maintained via sibling inbreeding for decades. Dr. Donald Bailey oversaw the breeding stocks in the NIH in the late 1950?s. When he took a position at The University of California, San Francisco, in 1961 he took with him breeder pairs of C57BL/6JN from which he maintained his own subline. When he returned to The Jackson Laboratory in 1967 he brought this line with him and when he transferred breeder pairs to the production facility at The Jackson Laboratory this inbred strain received the subline designation C57BL/6ByJ.

Related Strains

C57BL Strains
000665   C57BL/10J
003752   C57BL/10ScNJ
000476   C57BL/10ScSnJ
000666   C57BL/10SnJ
001822   C57BL/10SxJ
001197   C57BL/10WtRkJ
000663   C57BL/6By
009123   C57BL/6HaJ
000664   C57BL/6J
000924   C57BL/6JEiJ
005304   C57BL/6NJ
View C57BL Strains     (11 strains)

Strains carrying   Ahrb-1 allele
000136   B6.C-H34c/(HW22)ByJ
000663   C57BL/6By
000664   C57BL/6J
000662   C57BLKS/J
000667   C57BR/cdJ
000668   C57L/J
000669   C58/J
000351   CXB1/ByJ
000356   CXB6/ByJ
002937   D2.B6-Ahrb-1/J
000677   MA/MyJ
View Strains carrying   Ahrb-1     (11 strains)

Strains carrying other alleles of Ahr
000690   129P3/J
000645   A/HeJ
000646   A/J
000648   AKR/J
002920   B6(D2N).Spretus-Ahrb-3/J
002831   B6.129-Ahrtm1Bra/J
000130   B6.C-H17c/(HW14)ByJ
000370   B6.C-H38c/(HW119)ByJ
008599   B6.Cg-Del(9Cyp1a2-Cyp1a1)1Dwn Ahrd Tg(CYP1A1,CYP1A2)1Dwn/DwnJ
002921   B6.D2N-Ahrd/J
002727   B6;129-Ahrtm1Bra/J
001026   BALB/cByJ
000652   BDP/J
000653   BUB/BnJ
000659   C3H/HeJ
000926   CAROLI/EiJ
000928   CAST/EiJ
000656   CBA/J
000657   CE/J
000352   CXB2/ByJ
000353   CXB3/ByJ
000354   CXB4/ByJ
000355   CXB5/ByJ
000357   CXB7/ByJ
000671   DBA/2J
000673   HRS/J
000674   I/LnJ
000675   LG/J
000676   LP/J
000550   MOLF/EiJ
000684   NZB/BlNJ
000679   P/J
000930   PERA/EiJ
000726   RBF/DnJ
000682   RF/J
000644   SEA/GnJ
000280   SF/CamEiJ
000686   SJL/J
001146   SPRET/EiJ
000688   ST/bJ
006203   STOCK Ahrtm3.1Bra/J
000689   SWR/J
000693   WC/ReJ KitlSl/J
000933   YBR/EiJ
View Strains carrying other alleles of Ahr     (44 strains)

Additional Web Information

JAX® NOTES, April 1988; 433. H-2 Haplotypes of Mice from Jackson Laboratory Production Colonies.
JAX® NOTES, Fall 1995; 463. Inbred C57 Black Mice: Microphthalmia and Ocular Infections.
JAX® NOTES, Winter 2008; 512. New resource illustrates divergence of C57BL/6 laboratory mouse substrains.

Phenotype

Phenotype Information

View Phenotypic Data

View Research Applications

Research Applications
This mouse can be used to support research in many areas including:

Research Tools
Immunology, Inflammation and Autoimmunity Research
      background strain for histocompatibility congenics

Ahrb-1 related

Metabolism Research

Research Tools
Toxicology Research

Genes & Alleles

Gene & Allele Information provided by MGI

 
Allele Symbol Ahrb-1
Allele Name b-1 variant
Allele Type Not Applicable (Not Applicable)
Common Name(s) Ah; Ahb-1; Ahb; Ahhi; Ahrb; In;
Strain of OriginC57BL/6J
Gene Symbol and Name Ahr, aryl-hydrocarbon receptor
Chromosome 12
Gene Common Name(s) Ah; Ahh; Ahre; In; aromatic hydrocarbon responsiveness; aryl hydrocarbon hydroxylase; bHLHe76; dioxin receptor; inflammatory reactivity;
General Note C57BL/6 carries the responsive Ahrb allele; DBA/2 carries nonresponsive Ahrd. Heterozygotes (Ahrb/Ahrd) are responsive (J:5282). Later work identified a second (J:8895) and later a third (J:22144) allele conferring response. Thus the allele in C57, C58, and MA/My strains is now Ahrb-1; Ahrb-2 is carried by BALB/cBy, A, and C3H; and Ahrb-3 by Mus spretus, M. caroli, and MOLF/Ei. The nonresponsive strains AKR, DBA/2, and 129 carry Ahrd (J:22144). Nucleotide and amino acid sequence differences between Ahrb-1 and Ahrd have been determined (J:17460).

Strain of origin - this allele was found in C57BL/6, C58/J, C57BR, MA/My strains

Molecular Note This allele encodes a high affinity, relatively heat stabile, 95 kDa receptor. PCR sequencing of cDNA revealed ten nucleotide differences between the coding sequences of the DBA/2J and C57BL/6J receptors. Five of the ten differences would cause amino acid changes. One of these, a C to T transition in exon 11 would change the arginine codon in the DBA/2J allele to an opal termination codon in the C57BL/6J allele. This change would prevent the 43 amino acid extension of mRNA translation predicted for the DBA/2J allele and account for the smaller size of the peptide produced by this allele (95 kDa vs 104 kDa for the DBA/2J allele). A second C to T transition changes a proline codon in the DBA/2J allele to leucine codon in the C57BL/6J allele, and would likely change secondary structure of the peptide and thus ligand affinity. [MGI Ref ID J:15153] [MGI Ref ID J:17460] [MGI Ref ID J:477]

Genotyping

Genotyping Information


Helpful Links

Genotyping resources and troubleshooting

References

References provided by MGI

Selected Reference(s)

Petkov PM; Cassell MA; Sargent EE; Donnelly CJ; Robinson P; Crew V; Asquith S; Haar RV; Wiles MV. 2004. Development of a SNP genotyping panel for genetic monitoring of the laboratory mouse. Genomics 83(5):902-11. [PubMed: 15081119]  [MGI Ref ID J:89298]

Additional References

Poland A; Glover E. 1990. Characterization and strain distribution pattern of the murine Ah receptor specified by the Ahd and Ahb-3 alleles. Mol Pharmacol 38(3):306-12. [PubMed: 2169579]  [MGI Ref ID J:34840]

Smith BK; Andrews PK; West DB. 2000. Macronutrient diet selection in thirteen mouse strains. Am J Physiol Regul Integr Comp Physiol 278(4):R797-805. [PubMed: 10749765]  [MGI Ref ID J:61602]

Ahrb-1 related

Benedict WF; Considine N; Nebert DW. 1973. Genetic differences in aryl hydrocarbon hydroxylase induction and benzo(a)pyrene-produced tumorigenesis in the mouse. Mol Pharmacol 9(2):266-77. [PubMed: 4123113]  [MGI Ref ID J:84312]

Boobis AR; Nebert DW. 1976. Genetic differences in the metabolism of carcinogens and in the binding of benzo (a) pyrene metabolites to DNA. Adv Enzyme Regul 15:339-62. [PubMed: 1030186]  [MGI Ref ID J:12156]

Bradfield CA; Glover E; Poland A. 1991. Purification and N-terminal amino acid sequence of the Ah receptor from the C57BL/6J mouse. Mol Pharmacol 39(1):13-9. [PubMed: 1846217]  [MGI Ref ID J:84440]

Burbach KM; Poland A; Bradfield CA. 1992. Cloning of the Ah-receptor cDNA reveals a distinctive ligand-activated transcription factor. Proc Natl Acad Sci U S A 89(17):8185-9. [PubMed: 1325649]  [MGI Ref ID J:2256]

Castro DJ; Lohr CV; Fischer KA; Pereira CB; Williams DE. 2008. Lymphoma and lung cancer in offspring born to pregnant mice dosed with dibenzo[a,l]pyrene: the importance of in utero vs. lactational exposure. Toxicol Appl Pharmacol 233(3):454-8. [PubMed: 18848954]  [MGI Ref ID J:143604]

Chang C; Smith DR; Prasad VS; Sidman CL; Nebert DW; Puga A. 1993. Ten nucleotide differences, five of which cause amino acid changes, are associated with the Ah receptor locus polymorphism of C57BL/6 and DBA/2 mice. Pharmacogenetics 3(6):312-21. [PubMed: 8148872]  [MGI Ref ID J:17460]

Curran CP; Miller KA; Dalton TP; Vorhees CV; Miller ML; Shertzer HG; Nebert DW. 2006. Genetic differences in lethality of newborn mice treated in utero with coplanar versus non-coplanar hexabromobiphenyl. Toxicol Sci 89(2):454-64. [PubMed: 16291824]  [MGI Ref ID J:113285]

Ema M; Sogawa K; Watanabe N; Chujoh Y; Matsushita N; Gotoh O; Funae Y; Fujii-Kuriyama Y. 1992. cDNA cloning and structure of mouse putative Ah receptor. Biochem Biophys Res Commun 184(1):246-53. [PubMed: 1314586]  [MGI Ref ID J:477]

Gielen JE; Goujon FM; Nebert DW. 1972. Genetic regulation of aryl hydrocarbon hydroxylase induction. II. Simple Mendelian expression in mouse tissues in vivo. J Biol Chem 247(4):1125-37. [PubMed: 4110756]  [MGI Ref ID J:84250]

Goujon FM; Nebert DW; Gielen JE. 1972. Genetic expression of aryl hydrocarbon hydroxylase induction. IV. Interaction of various compounds with different forms of cytochrome P-450 and the effect on benzo(a)pyrene metabolism in vitro. Mol Pharmacol 8(6):667-80. [PubMed: 4118365]  [MGI Ref ID J:84252]

Hansen DA; Esakky P; Drury A; Lamb L; Moley KH. 2014. The aryl hydrocarbon receptor is important for proper seminiferous tubule architecture and sperm development in mice. Biol Reprod 90(1):8. [PubMed: 24174576]  [MGI Ref ID J:210360]

Harper PA; Golas CL; Okey AB. 1991. Ah receptor in mice genetically nonresponsive for cytochrome P4501A1 induction: cytosolic Ah receptor, transformation to the nuclear binding state, and induction of aryl hydrocarbon hydroxylase by halogenated and nonhalogenated aromatic hydrocarbons in embryonic tissues and cells. Mol Pharmacol 40(5):818-26. [PubMed: 1658612]  [MGI Ref ID J:2134]

Kerley-Hamilton JS; Trask HW; Ridley CJ; Dufour E; Lesseur C; Ringelberg CS; Moodie KL; Shipman SL; Korc M; Gui J; Shworak NW; Tomlinson CR. 2012. Inherent and benzo[a]pyrene-induced differential aryl hydrocarbon receptor signaling greatly affects life span, atherosclerosis, cardiac gene expression, and body and heart growth in mice. Toxicol Sci 126(2):391-404. [PubMed: 22228805]  [MGI Ref ID J:183715]

Kouri RE; Rude TH; Joglekar R; Dansette PM; Jerina DM; Atlas SA; Owens IS; Nebert DW. 1978. 2,3,7,8-tetrachlorodibenzo-p-dioxin as cocarcinogen causing 3-methylcholanthrene-initiated subcutaneous tumors in mice genetically 'nonresponsive' at Ah locus. Cancer Res 38(9):2777-83. [PubMed: 679184]  [MGI Ref ID J:84318]

Levova K; Moserova M; Nebert DW; Phillips DH; Frei E; Schmeiser HH; Arlt VM; Stiborova M. 2012. NAD(P)H:quinone oxidoreductase expression in Cyp1a-knockout and CYP1A-humanized mouse lines and its effect on bioactivation of the carcinogen aristolochic acid I. Toxicol Appl Pharmacol 265(3):360-7. [PubMed: 22982977]  [MGI Ref ID J:192865]

Lew BJ; Manickam R; Lawrence BP. 2011. Activation of the aryl hydrocarbon receptor during pregnancy in the mouse alters mammary development through direct effects on stromal and epithelial tissues. Biol Reprod 84(6):1094-102. [PubMed: 21270426]  [MGI Ref ID J:173706]

Moriguchi T; Motohashi H; Hosoya T; Nakajima O; Takahashi S; Ohsako S; Aoki Y; Nishimura N; Tohyama C; Fujii-Kuriyama Y; Yamamoto M. 2003. Distinct response to dioxin in an arylhydrocarbon receptor (AHR)-humanized mouse. Proc Natl Acad Sci U S A 100(10):5652-7. [PubMed: 12730383]  [MGI Ref ID J:132380]

Nebert DW; Atlas SA; Guenthner TM; Kouri RE. 1978. The Ah locus: genetic regulation of the enzymes which metabolize polycyclic hydrocarbons and the risk of cancer. In: Polycyclic Hydrocarbons and Cancer: Chemistry, Molecular Biology and Environment. Academic Press, New York.  [MGI Ref ID J:30693]

Nebert DW; Considine N; Owens IS. 1973. Genetic expression of aryl hydrocarbon hydroxylase induction. VI. Control of other aromatic hydrocarbon-inducible mono-oxygenase activities at or near the same genetic locus. Arch Biochem Biophys 157(1):148-59. [PubMed: 4716952]  [MGI Ref ID J:84313]

Nebert DW; Gelboin HV. 1969. The in vivo and in vitro induction of aryl hydrocarbon hydroxylase in mammalian cells of different species, tissues, strains, and developmental and hormonal states. Arch Biochem Biophys 134(1):76-89. [PubMed: 4981257]  [MGI Ref ID J:84248]

Nebert DW; Gielen JE. 1972. Genetic regulation of aryl hydrocarbon hydroxylase induction in the mouse. Fed Proc 31(4):1315-25. [PubMed: 4114109]  [MGI Ref ID J:5282]

Nebert DW; Gielen JE; Goujon FM. 1972. Genetic expression of aryl hydrocarbon hydroxylase induction. 3. Changes in the binding of n-octylamine to cytochrome P-450. Mol Pharmacol 8(6):651-66. [PubMed: 4118364]  [MGI Ref ID J:84251]

Nebert DW; Goujon FM; Gielen JE. 1972. Aryl hydrocarbon hydroxylase induction by polycyclic hydrocarbons: simple autosomal dominant trait in the mouse. Nat New Biol 236(65):107-10. [PubMed: 4502804]  [MGI Ref ID J:84249]

Nebert DW; Robinson JR; Niwa A; Kumaki K; Poland AP. 1975. Genetic expression of aryl hydrocarbon hydroxylase activity in the mouse. J Cell Physiol 85(2 Pt 2 Suppl 1):393-414. [PubMed: 1091656]  [MGI Ref ID J:84317]

Niwa A; Kumaki K; Nebert DW; Poland AP. 1975. Genetic expression of aryl hydrocarbon hydroxylase activity in the mouse. Distinction between the 'responsive' homozygote and heterozygote at the Ah locus. Arch Biochem Biophys 166(2):559-64. [PubMed: 1119809]  [MGI Ref ID J:84316]

Nukaya M; Lin BC; Glover E; Moran SM; Kennedy GD; Bradfield CA. 2010. The aryl hydrocarbon receptor-interacting protein (AIP) is required for dioxin-induced hepatotoxicity but not for the induction of the Cyp1a1 and Cyp1a2 genes. J Biol Chem 285(46):35599-605. [PubMed: 20829355]  [MGI Ref ID J:166864]

Okey AB; Vella LM; Harper PA. 1989. Detection and characterization of a low affinity form of cytosolic Ah receptor in livers of mice nonresponsive to induction of cytochrome P1-450 by 3-methylcholanthrene. Mol Pharmacol 35(6):823-30. [PubMed: 2543914]  [MGI Ref ID J:27899]

Poel WE; Stanton D; Peters E; Wade HO. 1958. Comparative susceptibilities of seven inbred strains of mice to qualified applications of 3, 4-benzpyrene Proc Am Assoc Cancer Res 2:335.  [MGI Ref ID J:84245]

Poland A; Bradfield C. 1992. A brief review of the Ah locus. Tohoku J Exp Med 168(2):83-7. [PubMed: 1339107]  [MGI Ref ID J:12546]

Poland A; Glover E. 1990. Characterization and strain distribution pattern of the murine Ah receptor specified by the Ahd and Ahb-3 alleles. Mol Pharmacol 38(3):306-12. [PubMed: 2169579]  [MGI Ref ID J:34840]

Poland A; Glover E; Kende AS. 1976. Stereospecific, high affinity binding of 2,3,7,8-tetrachlorodibenzo-p-dioxin by hepatic cytosol. Evidence that the binding species is receptor for induction of aryl hydrocarbon hydroxylase. J Biol Chem 251(16):4936-46. [PubMed: 956169]  [MGI Ref ID J:84247]

Poland A; Glover E; Taylor BA. 1987. The murine Ah locus: a new allele and mapping to chromosome 12. Mol Pharmacol 32(4):471-8. [PubMed: 2823093]  [MGI Ref ID J:8895]

Poland A; Palen D; Glover E. 1994. Analysis of the four alleles of the murine aryl hydrocarbon receptor. Mol Pharmacol 46(5):915-21. [PubMed: 7969080]  [MGI Ref ID J:22144]

Poland AP; Glover E; Robinson JR; Nebert DW. 1974. Genetic expression of aryl hydrocarbon hydroxylase activity. Induction of monooxygenase activities and cytochrome P1-450 formation by 2,3,7,8-tetrachlorodibenzo-p-dioxin in mice genetically 'nonresponsive' to other aromatic hydrocarbons. J Biol Chem 249(17):5599-606. [PubMed: 4370044]  [MGI Ref ID J:84314]

Robinson JR; Considine N; Nebert DW. 1974. Genetic expression of aryl hydrocarbon hydroxylase induction. Evidence for the involvement of other genetic loci. J Biol Chem 249(18):5851-9. [PubMed: 4413562]  [MGI Ref ID J:84315]

Schmid FA; Demetriades MS; Schabel FM 3rd; Tarnowski GS. 1967. Toxicity of several cancerigenic polycyclic hydrocarbons and other agents in AKR and C57BL-6 mice. Cancer Res 27(3):563-7. [PubMed: 6021514]  [MGI Ref ID J:84246]

Schmid FA; Elmer I; Tarnowski GS. 1969. Genetic determination of differential inflammatory reactivity and subcutaneous tumor susceptibility of AKR-J and C57BL-6J mice to 7,12-dimethylbenz- [a]anthracene. Cancer Res 29(8):1585-9. [PubMed: 5807232]  [MGI Ref ID J:34134]

Schmid FA; Pena RC; Robinson W; Tarnowski GS. 1967. Toxicity of intraperitoneal injections of 7, 12-dimethylbenz[a]anthracene in inbred mice. Cancer Res 27(3):558-62. [PubMed: 6021513]  [MGI Ref ID J:26440]

Schmidt JV; Carver LA; Bradfield CA. 1993. Molecular characterization of the murine Ahr gene. Organization, promoter analysis, and chromosomal assignment. J Biol Chem 268(29):22203-9. [PubMed: 8408082]  [MGI Ref ID J:15153]

Smith AG; Clothier B; Robinson S; Scullion MJ; Carthew P; Edwards R; Luo J; Lim CK; Toledano M. 1998. Interaction between iron metabolism and 2,3,7,8-tetrachlorodibenzo-p-dioxin in mice with variants of the Ahr gene: a hepatic oxidative mechanism. Mol Pharmacol 53(1):52-61. [PubMed: 9443932]  [MGI Ref ID J:45850]

Stiborova M; Levova K; Barta F; Shi Z; Frei E; Schmeiser HH; Nebert DW; Phillips DH; Arlt VM. 2012. Bioactivation versus detoxication of the urothelial carcinogen aristolochic acid I by human cytochrome P450 1A1 and 1A2. Toxicol Sci 125(2):345-58. [PubMed: 22086975]  [MGI Ref ID J:183662]

Taylor BA. 1971. Strain distribution and linkage tests of 7,12-dimethylbenzanthracene (DMBA) inflammatory response in mice. Life Sci I 10(19):1127-34. [PubMed: 5132702]  [MGI Ref ID J:5244]

Thomas PE; Hutton JJ; Taylor BA. 1973. Genetic relationship between aryl hydrocarbon hydroxylase inducibility and chemical carcinogen induced skin ulceration in mice. Genetics 74(4):655-9. [PubMed: 4750810]  [MGI Ref ID J:5387]

Thomas PE; Kouri RE; Hutton JJ. 1972. The genetics of aryl hydrocarbon hydroxylase induction in mice: a single gene difference between C57BL-6J and DBA-2J. Biochem Genet 6(2):157-68. [PubMed: 4666754]  [MGI Ref ID J:31977]

Yu Z; Mahadevan B; Lohr CV; Fischer KA; Louderback MA; Krueger SK; Pereira CB; Albershardt DJ; Baird WM; Bailey GS; Williams DE. 2006. Indole-3-carbinol in the maternal diet provides chemoprotection for the fetus against transplacental carcinogenesis by the polycyclic aromatic hydrocarbon dibenzo[a,l]pyrene. Carcinogenesis 27(10):2116-23. [PubMed: 16704990]  [MGI Ref ID J:113356]

Health & husbandry

Health & Colony Maintenance Information

Animal Health Reports

Room Number           AX10

Colony Maintenance

Mating SystemSibling x Sibling         (Female x Male)   01-MAR-06
Diet Information LabDiet® 5K52/5K67

Pricing and Purchasing

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Repository-Live.
Repository-Live represents an exclusive set of over 1800 unique mouse models across a vast array of research areas. Breeding colonies provide mice for large and small orders and fluctuate in size depending on current research demand. If a strain is not immediately available, you will receive an estimated availability timeframe for your inquiry or order in 2-3 business days. Repository strains typically are delivered at 4 to 8 weeks of age. Requests for specific ages will be noted but not guaranteed and we do not accept age requests for breeder pairs. However, if cohorts of mice (5 or more of one gender) are needed at a specific age range for experiments, we will do our best to accommodate your age request.

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Price per mouse (US dollars $)Gender
Individual Mouse $175.50Female or Male  

Standard Supply

Repository-Live.
Repository-Live represents an exclusive set of over 1800 unique mouse models across a vast array of research areas. Breeding colonies provide mice for large and small orders and fluctuate in size depending on current research demand. If a strain is not immediately available, you will receive an estimated availability timeframe for your inquiry or order in 2-3 business days. Repository strains typically are delivered at 4 to 8 weeks of age. Requests for specific ages will be noted but not guaranteed and we do not accept age requests for breeder pairs. However, if cohorts of mice (5 or more of one gender) are needed at a specific age range for experiments, we will do our best to accommodate your age request.

View USA Canada and Mexico Pricing View International Pricing

Standard Supply

Repository-Live.
Repository-Live represents an exclusive set of over 1800 unique mouse models across a vast array of research areas. Breeding colonies provide mice for large and small orders and fluctuate in size depending on current research demand. If a strain is not immediately available, you will receive an estimated availability timeframe for your inquiry or order in 2-3 business days. Repository strains typically are delivered at 4 to 8 weeks of age. Requests for specific ages will be noted but not guaranteed and we do not accept age requests for breeder pairs. However, if cohorts of mice (5 or more of one gender) are needed at a specific age range for experiments, we will do our best to accommodate your age request.

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