Phylogenetic relationships between sea bass NITR V domains. Maximum likelihood tree of V domains encoded by 27 sea bass NITRs. Gene names are indicated. Bootstrap values are assigned to each interior branch; bootstrap values less than 50 are not shown. Branch lengths correspond to the number of aminoacid substitutions, with the scale indicated at the bottom of the figure. Generalised genomic organisations of each NITRs group is shown (not to scale). Rectangles correspond to exons (L leader, V V domain, I I domain, CP putative connecting peptide, TM transmembrane domain, Cyt1 and Cyt2 cytoplasmic domains)