Figure 2. Multiple alignments of the predicted amino acid sequences.

Alignment of sequences derived from four sheep DRA transcripts in comparison with the orthologous goat, cattle buffalo and pig sequences shown in Supplementary Figure S1. Sequences are numbered from the first amino acid of the mature protein. Amino acid identity is represented by dots (.) and amino acids predicted [47] to be associated with the peptide binding domain are highlighted with the + symbol. Ten sites under positive selection are labelled •. TM, transmembrane and CP, cytoplasmic domains.