Alignment of salmonid MHC class II alpha sequences. Genbank accession numbers are as follows: Sasa-DAA*0101 [Genbank: L77086], Onmy-DAA*02 [Genbank: CAB96451], Sasa-DBA (630N19) [Genbank: EG757343], Sasa-DCA [Genbank: DW549478], Onmy-DCA [Genbank: CR376525], Sasa-DDA [Genbank: DW557800], Onmy-DDA [Genbank: BX085673]. Dots indicate identities, dashes indicate gaps or missing sequence information. Cysteine residues involved in putative Ig fold are bold and underlined, and the unique N-linked glycosylation sites found in salmonids are boxed. Individual domains and regions are defined based on mammalian class II sequences.