Table 1. Genotypic identity at MHC class I and II loci by cDNA sequencing.

	% nucleotide sequence homology
	MHC class I loci		MHC class II loci
Strain	H2-K	H2-D	H2-Aα	H2-Aβ	H2-Eα	H2-Eβ
H2b haplotype
GenBank strain	C57BL/10	C57BL/10	129	NA	NA	B6
B6	100	100	100	100	—	100
BALB.B	100	100	100	100	—	100
H2k haplotype
GenBank strain	C3H	C3H	A/J	B10.A	NA	B10.A
AKR/J	100	100	100	100	100	100
B10.BR	100	100	100	100	100	100
BALB.K	100	100	100	100	100	100

MHC locus-specific PCR amplicons from cDNA templates spanning exons 2-4 (class I genes) and exons 2-3 (class II genes) were directly sequenced in both forward and reverse directions. Shown is percent nucleotide sequence homology for each mouse strain with a GenBank sequence at each locus. Reference cDNA sequences were not available for H2-Aβ^b, H2-Eα^b, and H2-Eα^k; H2-Eα is not expressed in H2^b haplotype strains. Percent homology at the H2-Aβ^b and H2-Eα^k loci represents interstrain comparison of mice used in this study. NA, not available.