The strain was originally developed at the Sloan Kettering Institute where it was backcrossed onto a non-specified C57BL/6 strain. The congenic strain "C57BL/6-Ly5.1" carries the allele of the SJL mouse in the Ptprc gene locus: "Ptprca " or "CD45.1" or “Ly5.1”, which was renamed from “Ly-5.2” in 1987. To NCI via NIAID in 1983. To Charles River in 2014. Charles River breeds CD45.1 expressing B6.SJL-PtprcaPepcb/BoyCrCrl mice at our Frederick Facility in the US.

Coat Color


MHC Haplotype


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  • US

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