Twenty-one of the amino terminal twenty-seven amino acid residues have been assigned in the murine H-2Kq molecule and several additional assignments and corrections have been made in both the H-2Kk and H-2Kb molecules. The study shows that 1) H-2Kk and H-Kq, which are serologically related, have an identical amino acid sequence for all twenty positions that can be compared, 2) the H-2Kk and H-2Kq molecules differ from H-2Kb at only two positions-9 and 22, and 3) the additional sequence data on the H-2Kk, -Kb, and -Kq molecules increases the already striking homology between murine and human transplantation antigens.

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