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Level 2

Common Names: B6N;     Black 6N;    
This is an NIH subline of C57BL/6. It was separated from C57BL/6J in 1951. Five SNP differences have been identified that distinguish C57BL/6J from C57BL/6ByJ and C57BL/6NJ. This strain does not have the deletion in the Nnt gene that has been found in the C57BL/6J strain (Stock No. 000664).


Strain Information

Former Names C57BL/6NCrJ    (Changed: 26-APR-05 )
Type Inbred Strain;
Additional information on Inbred Strains.
Visit our online Nomenclature tutorial.
Mating SystemInbred x Inbred         (Female x Male)   01-MAR-06
Breeding Considerations This strain is a good breeder.
Specieslaboratory mouse
GenerationF?+5pF3pF10 (14-AUG-14)
Generation Definitions

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Related Genotype: a/a

Important Note
This strain is homozygous for Crb1rd8, the retinal degeneration 8 mutation. Photoreceptor degeneration is observed in spots, caused by retinal folds and pseudorosettes, found in the fundus of the eye.

This is an NIH subline of C57BL/6. It was separated from C57BL/6J in 1951. 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 (rs3709624) is C; 11-004367508-M (rs3659787) is A; 13-041017317-M (rs3722313) is C; 15-057561875-M (rs3702158) is G; 19-049914266-M (rs3724876) 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.) This strain does not have the deletion in the Nnt gene that has been found in the C57BL/6J strain (Stock No. 000664). C57BL/6NJ mice are homozygous for Cyfip2M1N, a spontaneous mutation in the cytoplasmic FMR1 interacting protein 2 that results in an amino acid substitution of phenylalanine for serine at position 968 (S968F). The mutation is found in all C57BL/6N substrains but is not present in the C57BL/6J strain or substrains. The mutation results in 45% lower acute response to cocaine as measured by locomotor hyperactivity.

In 1951 C57BL/6J, then at generation F32, were sent from The Jackson Laboratory to The National Institute of Health where they were maintained via sibling mating for decades. In 1980 this subline reached F126 and in 1984 embryos were cryopreserved at the NIH cryopreservation facility. In approximately 1994 some of these embryos were thawed and maintained via sibling mating and this subline was referred to as B6(e84) to specify that it derived from the embryos frozen in 1984. In September and October of 1997 a new set of embryos were cryopreserved from this thawed line by backcrossing +F6 females to their +F5 fathers. In 2005 some of these embryos frozen in 1997 were sent to The Jackson Laboratory where they were thawed and gave rise to C57BL/6NJ. Thus, C57BL/6NJ is devoid of mutations that may have arisen in any C57BL/6N sublines that remained on the shelf after the 1984 freeze. The embryos received by The Jackson Laboratory were thawed, the colony expanded, and re-frozen immediately. This strain is maintained with frequent replenishment from this frozen stock in order to arrest genetic drift.

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
001139   C57BL/6ByJ
009123   C57BL/6HaJ
000664   C57BL/6J
000924   C57BL/6JEiJ
View C57BL Strains     (11 strains)

Strains carrying   Crb1rd8 allele
005711   B6.129P2-Prkcqtm1Litt/J
004852   B6;129-Crb1rd8/J
001633   CXB12/HiAJ
000352   CXB2/ByJ
000353   CXB3/ByJ
000355   CXB5/ByJ
001630   CXB9/HiAJ
003392   STOCK Crb1rd8/J
View Strains carrying   Crb1rd8     (8 strains)

Strains carrying other alleles of Crb1
022521   C57BL/6NJ-Crb1rd8+em1Mvw/MvwJ
View Strains carrying other alleles of Crb1     (1 strain)

Additional Web Information

JAX® NOTES, Fall 2008; 511. Influence of Nnt alleles on DIO in C57BL/6 JAX® Mice.
JAX® NOTES, Winter 2008; 512. New resource illustrates divergence of C57BL/6 laboratory mouse substrains.
Request a copy of our Divergence of C57BL/6 Laboratory Mouse poster.
Sequence data is available from the Mouse Genomes Project at the Wellcome Trust Sanger Institute


Phenotype Information

View Phenotypic Data

Phenotypic Data

Body Weight Information - JAX® Mice Strain C57BL/6NJ (005304)

(This chart reflects the typical correlation between body weight and age for mice maintained in production colonies at The Jackson Laboratory.)
Mouse Phenome Database
Festing Inbred Strain Characteristics: C57BL
View Related Disease (OMIM) Terms

Related Disease (OMIM) Terms provided by MGI
- Potential model based on gene homology relationships. Phenotypic similarity to the human disease has not been tested.
Leber Congenital Amaurosis 8; LCA8   (CRB1)
Pigmented Paravenous Chorioretinal Atrophy; PPCRA   (CRB1)
Retinitis Pigmentosa 12; RP12   (CRB1)
View Research Applications

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

Research Tools
General Purpose

Crb1rd8 related

Cell Biology Research
Defects in Cell Adhesion Molecules

Developmental Biology Research
Eye Defects

Sensorineural Research
Retinal Degeneration

Genes & Alleles

Gene & Allele Information provided by MGI

Allele Symbol Crb1rd8
Allele Name retinal degeneration 8
Allele Type Spontaneous
Common Name(s) Rd8-; nmf144;
Strain of OriginC57BL/6J
Gene Symbol and Name Crb1, crumbs homolog 1 (Drosophila)
Chromosome 1
Gene Common Name(s) 7530426H14Rik; A930008G09Rik; LCA8; RIKEN cDNA 7530426H14 gene; RIKEN cDNA A930008G09 gene; RP12;
Molecular Note The mutation in the rd8 mouse has been identified as a single base deletion in the Crb1 gene. This deletion causes a frame shift and a premature stop codon that truncates the transmembrane and cytoplasmic domain of the protein. [MGI Ref ID J:85459]
Allele Symbol Cyfip2M1N
Allele Name mutation 1, National Institutes of Health
Allele Type Spontaneous
Common Name(s) Cyfip2B6N;
Strain of OriginC57BL/6N
Gene Symbol and Name Cyfip2, cytoplasmic FMR1 interacting protein 2
Chromosome 11
Gene Common Name(s) 1500004I01Rik; 6430511D02Rik; AA930218; AU022376; PIR121; RIKEN cDNA 1500004I01 gene; RIKEN cDNA 6430511D02 gene; expressed sequence AA930218; expressed sequence AU022376; mKIAA1168;
Molecular Note An G to A mutation at 46,036,117 base pair (bp) of chromosome 11 (mm9) occured between 1961 and 1974 in the C57BL/6N strain that resulted in the amino acid substitution of phenylalanine for serine at position 968 (S968F). This mutation is found in all C57BL/6N substrains (C57BL/6NCrl, C57BL/6NTac and C57BL/6NJ) but is not present in the C57BL/6J strain or substrains (C57BL/6Ei, C57BL/6EiJ, C57BL/6ByJ and C57BL/6By). The mutation destabilizes the protein leading to decreased half-life. [MGI Ref ID J:203183]


Genotyping Information

Genotyping Protocols

Crb1rd8End Point, End Point Analysis
Kif1a, End Point Analysis

Separated MCA

Nnt, Separated PCR

Inbred mouse strains are maintained through sibling (sister x brother) matings; no genotyping required.

Helpful Links

Genotyping resources and troubleshooting


References provided by MGI

Selected Reference(s)

Keane TM; Goodstadt L; Danecek P; White MA; Wong K; Yalcin B; Heger A; Agam A; Slater G; Goodson M; Furlotte NA; Eskin E; Nellaker C; Whitley H; Cleak J; Janowitz D; Hernandez-Pliego P; Edwards A; Belgard TG; Oliver PL; McIntyre RE; Bhomra A; Nicod J; Gan X; Yuan W; van der Weyden L; Steward CA; Bala S; Stalker J; Mott R; Durbin R; Jackson IJ; Czechanski A; Guerra-Assuncao JA; Donahue LR; Reinholdt LG; Payseur BA; Ponting CP; Birney E; Flint J; Adams DJ. 2011. Mouse genomic variation and its effect on phenotypes and gene regulation. Nature 477(7364):289-94. [PubMed: 21921910]  [MGI Ref ID J:177037]

Kumar V; Kim K; Joseph C; Kourrich S; Yoo SH; Huang HC; Vitaterna MH; de Villena FP; Churchill G; Bonci A; Takahashi JS. 2013. C57BL/6N mutation in Cytoplasmic FMRP interacting protein 2 regulates cocaine response. Science 342(6165):1508-12. [PubMed: 24357318]  [MGI Ref ID J:203183]

Toye AA; Lippiat JD; Proks P; Shimomura K; Bentley L; Hugill A; Mijat V; Goldsworthy M; Moir L; Haynes A; Quarterman J; Freeman HC; Ashcroft FM; Cox RD. 2005. A genetic and physiological study of impaired glucose homeostasis control in C57BL/6J mice. Diabetologia 48(4):675-86. [PubMed: 15729571]  [MGI Ref ID J:106692]

Additional References

Crb1rd8 related

Aleman TS; Cideciyan AV; Aguirre GK; Huang WC; Mullins CL; Roman AJ; Sumaroka A; Olivares MB; Tsai FF; Schwartz SB; Vandenberghe LH; Limberis MP; Stone EM; Bell P; Wilson JM; Jacobson SG. 2011. Human CRB1-associated retinal degeneration: comparison with the rd8 Crb1-mutant mouse model. Invest Ophthalmol Vis Sci 52(9):6898-910. [PubMed: 21757580]  [MGI Ref ID J:181396]

Barber AC; Hippert C; Duran Y; West EL; Bainbridge JW; Warre-Cornish K; Luhmann UF; Lakowski J; Sowden JC; Ali RR; Pearson RA. 2013. Repair of the degenerate retina by photoreceptor transplantation. Proc Natl Acad Sci U S A 110(1):354-9. [PubMed: 23248312]  [MGI Ref ID J:192521]

Chang B; Hawes NL; Hurd RE; Davisson MT; Nusinowitz S; Heckenlively JR. 2002. Retinal degeneration mutants in the mouse. Vision Res 42(4):517-25. [PubMed: 11853768]  [MGI Ref ID J:75095]

Chang B; Hawes NL; Hurd RE; Wang J; Howell D; Davisson MT; Roderick TH; Nusinowitz S; Heckenlively JR. 2005. Mouse models of ocular diseases. Vis Neurosci 22(5):587-93. [PubMed: 16332269]  [MGI Ref ID J:156373]

Chang B; Hurd R; Wang J; Nishina P. 2013. Survey of common eye diseases in laboratory mouse strains. Invest Ophthalmol Vis Sci 54(7):4974-81. [PubMed: 23800770]  [MGI Ref ID J:198916]

Chen M; Glenn JV; Dasari S; McVicar C; Ward M; Colhoun L; Quinn M; Bierhaus A; Xu H; Stitt AW. 2014. RAGE regulates immune cell infiltration and angiogenesis in choroidal neovascularization. PLoS One 9(2):e89548. [PubMed: 24586862]  [MGI Ref ID J:213819]

Chen Y; Sawada O; Kohno H; Le YZ; Subauste C; Maeda T; Maeda A. 2013. Autophagy protects the retina from light-induced degeneration. J Biol Chem 288(11):7506-18. [PubMed: 23341467]  [MGI Ref ID J:196891]

Kohno H; Maeda T; Perusek L; Pearlman E; Maeda A. 2014. CCL3 production by microglial cells modulates disease severity in murine models of retinal degeneration. J Immunol 192(8):3816-27. [PubMed: 24639355]  [MGI Ref ID J:210001]

Lakowski J; Baron M; Bainbridge J; Barber AC; Pearson RA; Ali RR; Sowden JC. 2010. Cone and rod photoreceptor transplantation in models of the childhood retinopathy Leber congenital amaurosis using flow-sorted Crx-positive donor cells. Hum Mol Genet :. [PubMed: 20858907]  [MGI Ref ID J:165574]

Low BE; Krebs MP; Joung JK; Tsai SQ; Nishina PM; Wiles MV. 2014. Correction of the Crb1rd8 allele and retinal phenotype in C57BL/6N mice via TALEN-mediated homology-directed repair. Invest Ophthalmol Vis Sci 55(1):387-95. [PubMed: 24346171]  [MGI Ref ID J:206789]

Luhmann UF; Carvalho LS; Robbie SJ; Cowing JA; Duran Y; Munro PM; Bainbridge JW; Ali RR. 2013. Ccl2, Cx3cr1 and Ccl2/Cx3cr1 chemokine deficiencies are not sufficient to cause age-related retinal degeneration. Exp Eye Res 107:80-7. [PubMed: 23232206]  [MGI Ref ID J:210432]

Mattapallil MJ; Wawrousek EF; Chan CC; Zhao H; Roychoudhury J; Ferguson TA; Caspi RR. 2012. The rd8 mutation of the Crb1 gene is present in vendor lines of C57BL/6N mice and embryonic stem cells, and confounds ocular induced mutant phenotypes. Invest Ophthalmol Vis Sci :. [PubMed: 22447858]  [MGI Ref ID J:182353]

Mehalow AK; Kameya S; Smith RS; Hawes NL; Denegre JM; Young JA; Bechtold L; Haider NB; Tepass U; Heckenlively JR; Chang B; Naggert JK; Nishina PM. 2003. CRB1 is essential for external limiting membrane integrity and photoreceptor morphogenesis in the mammalian retina. Hum Mol Genet 12(17):2179-89. [PubMed: 12915475]  [MGI Ref ID J:85459]

Mirza M; Volz C; Karlstetter M; Langiu M; Somogyi A; Ruonala MO; Tamm ER; Jagle H; Langmann T. 2013. Correction: Progressive Retinal Degeneration and Glial Activation in the CLN6 Mouse Model of Neuronal Ceroid Lipofuscinosis: A Beneficial Effect of DHA and Curcumin Supplementation. PLoS One 8(10):. [PubMed: 24130650]  [MGI Ref ID J:209126]

Perkins GA; Scott R; Perez A; Ellisman MH; Johnson JE; Fox DA. 2012. Bcl-xL-mediated remodeling of rod and cone synaptic mitochondria after postnatal lead exposure: electron microscopy, tomography and oxygen consumption. Mol Vis 18:3029-48. [PubMed: 23288995]  [MGI Ref ID J:192587]

Wang Y; Abu-Asab MS; Yu CR; Tang Z; Shen D; Tuo J; Li X; Chan CC. 2014. Platelet-derived growth factor (PDGF)-C inhibits neuroretinal apoptosis in a murine model of focal retinal degeneration. Lab Invest 94(6):674-82. [PubMed: 24709779]  [MGI Ref ID J:210964]

Won J; Shi LY; Hicks W; Wang J; Hurd R; Naggert JK; Chang B; Nishina PM. 2011. Mouse model resources for vision research. J Ophthalmol 2011:391384. [PubMed: 21052544]  [MGI Ref ID J:166679]

Zhang N; Kolesnikov AV; Jastrzebska B; Mustafi D; Sawada O; Maeda T; Genoud C; Engel A; Kefalov VJ; Palczewski K. 2013. Autosomal recessive retinitis pigmentosa E150K opsin mice exhibit photoreceptor disorganization. J Clin Invest 123(1):121-37. [PubMed: 23221340]  [MGI Ref ID J:194158]

Health & husbandry

Health & Colony Maintenance Information

Animal Health Reports

Room Number           AX5
Room Number           AX6
Room Number           MP13
Room Number           RB07

Colony Maintenance

Mating SystemInbred x Inbred         (Female x Male)   01-MAR-06
Breeding Considerations This strain is a good breeder.
Diet Information LabDiet® 5K52/5K67

Pricing and Purchasing

Pricing, Supply Level & Notes, Controls

Pricing for USA, Canada and Mexico shipping destinations View International Pricing

Live Mice

Weeks of AgePrice per mouse (US dollars $)Gender
3 weeks $21.05Female  
4 weeks $21.05Female  
5 weeks $22.55Female  
6 weeks $22.55Female  
7 weeks $25.85Female  
8 weeks $26.35Female  
9 weeks $26.35Female  
10 weeks $31.45Female  
11 weeks $31.45Female  
12 weeks $32.35Female  

Standard Supply

Level 2. Up to 100 mice. Larger quantities or custom orders arranged upon request.

Supply Notes

Pricing for International shipping destinations View USA Canada and Mexico Pricing

Live Mice

Weeks of AgePrice per mouse (US dollars $)Gender
3 weeks $27.40Female  
4 weeks $27.40Female  
5 weeks $29.40Female  
6 weeks $29.40Female  
7 weeks $33.70Female  
8 weeks $34.30Female  
9 weeks $34.30Female  
10 weeks $40.90Female  
11 weeks $40.90Female  
12 weeks $42.10Female  

Standard Supply

Level 2. Up to 100 mice. Larger quantities or custom orders arranged upon request.

Supply Notes

  • Shipped at a specific age in weeks. Mice at a precise age in days, littermates and retired breeders are also available.
View USA Canada and Mexico Pricing View International Pricing

Standard Supply

Level 2. Up to 100 mice. Larger quantities or custom orders arranged upon request.

Important Note

This strain is homozygous for Crb1rd8, the retinal degeneration 8 mutation. Photoreceptor degeneration is observed in spots, caused by retinal folds and pseudorosettes, found in the fundus of the eye.

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The Jackson Laboratory has rigorous genetic quality control and mutant gene genotyping programs to ensure the genetic background of JAX® Mice strains as well as the genotypes of strains with identified molecular mutations. JAX® Mice strains are only made available to researchers after meeting our standards. However, the phenotype of each strain may not be fully characterized and/or captured in the strain data sheets. Therefore, we cannot guarantee a strain's phenotype will meet all expectations. To ensure that JAX® Mice will meet the needs of individual research projects or when requesting a strain that is new to your research, we suggest ordering and performing tests on a small number of mice to determine suitability for your particular project.
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