Amino acid alignment of β1-domain. MHII β1 sequences for H. abdominalis (Hiab), Homo sapiens (Hosa) and published teleost species (see methods). "S" represents positively selected sites in the seahorse as inferred from the exon 2 dataset, "B" indicates human PBS according to Brown et al.  and "R" reflects human PBS according to Reche and Reinherz . Amino acid positions of the human MHII β1-domain are indicated below the human sequence.
Bahr and Wilson BMC Evolutionary Biology 2011 11:121 doi:10.1186/1471-2148-11-121