Alignment of MHC class II B exon 2 amino acid sequences. Three hawk species are included: Buteo galapagoensis (Buga), B. swainsoni (Busw), and B. buteo (Butbu). The B. buteo sequences are from Alcaide et al. . Putative peptide-binding sites based on Brown et al.  and Tong et al.  are indicated by asterisks and black dots, respectively. Sites identified as conserved by Kaufman et al.  are shaded gray, while sites identified by CODEML as being under positive selection by model M8 with a posterior probability >0.99 are in boxes. Periods indicate identity with sequence Buga*01 and dashes indicate deletions.
Bollmer et al. BMC Evolutionary Biology 2011 11:143 doi:10.1186/1471-2148-11-143