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Mhc class II B structure in house finches (Came–DAB1), red-winged blackbirds (Agph–DAB1; Edwards et al. 1998), and chickens (B-LBII; Zoorob et al. 1990). The asterisks represent frameshift mutations indicating the nonfunctional nature of Came–DAB1. The shaded exon represents the polymorphic second exon encoding the peptide binding region. Intron and exon sizes are to scale. Dashes signify that the gene continues downstream.
