Fig. 5

Divergence in expression profile of duplicated IAPs in the hard clam. a Tandem duplication of six IAPs in a ~ 90 kb region, with expression divergence among different organs and stages during aerial exposure. b Selective pressure on the six duplicated IAPs. c Gene model prediction for the six duplicated IAPs; lines represent introns, and boxes represent exons. Regions encoding different domains are colored accordingly. Numbers above introns indicate phase of each intron. d Boundaries of domains found in hard clam IAPs