Thirteen new chromosome-7 congenic lines

Thirteen new congenic lines have been produced which have chromosome-7 segments introduced from different strains onto the C57BL/10Sn background. Sublines B10.P(61NX)C,D, and E received chromosome-7 segments from P/J, B10.CE(62NX) from CE/J, B10.SEC(64NX)A,C,E, and F from SEC/1Re, B10.SM(65NX) from SM/J, B10.WB(66NX) from WB/Re, B10.A(67NX) from A/SnGrf, B10.AKR(68NX) from AKR/SnGrf, and B10.K(69NX) from C3H.K. Isograft testing indicated that three sublines, B10.P(61NX)D, B10.CE(62NX)B, and B10.WB(66NX)B are histoisogenic, i.e., histocompatible within each line. With the exception of B10.A(67NX), B10.AK(68NX), and B10.K(69NX), which have not been isografted, the remaining sublines showed residual heterozygosity on isografting. The three histoisogenic lines have undergone F₁ testing and have been found to possess theH-4^a allele and new and distinct alleles at theH-1 locus. They have been designated B10.P(61NX)-H-4^aH-1^d, B10.WB(66NX)-H-4^aH-1^e, and B10.CE(62NX)-H-4^aH-1^f. Direct exchange of grafts has indicated the following genotypes: B10.A(67NX)-H-4^aH-1^b, B10.AK(68NX)-H-4^aH-1^b, and B10.K(69NX)-F-4^aH-1^b. The B10.SEC(64NX) and B10.SM(65NX) sublines have not been typed completely forH-4 andH-1. F₁ testing or direct exchange of skin grafts indicated that B10.P(61NX)-H-4^aH-1^d, B10.WB(66NX)-H-4^aH-1^e, B10.A(67NX)-H-4^aH-1^b B10.AK(68NX)-H-4^aH-1^b and B10.K(69NX)-H-4^aH1^b possess nonon-H-1 histocompatibility differences from the G57BL/10 background.