Nucleotide Sequence of a Light Chain Gene of the Mouse I-A Subregion: Aβ^d
Iɑ (I region-associated) antigens are cell-surface glycoproteins involved in the regulation of immune responsiveness. They are composed of one heavy (ɑ) and one light (β) polypeptide chain. We have sequenced the gene encoding the Aβ^d chain of the BALB/c mouse. The presence of six exons is predicted by comparison with the complementary DNA sequences of human β chains and with partial protein sequence data for the Aβ^d polypeptide. Sequence comparisons have been made to other proteins involved in immune responses and the consequent implications for the evolutionary relationships of these genes are discussed.