Fig. 2. D204 encodes the zebrafish ortholog of PlexinA4 (Accession Number, AB103158). (A) The phylogenic tree indicates that D204 encodes the zebrafish ortholog of PlexinA4. (B) Schematic drawing of the domain structure of the Plexin family and identity of amino acids between zebrafish and mouse PlexinA4. MRS/PSI domain is Met related sequence/plexin, semaphorin, integrin domain. G-P/IPT motif is glycine-proline rich/immunoglobin-like fold shared by plexins and transcription factors motif. SP domain is plexin-specific sex plexin domain. m, mouse; x, Xenopus laevis; z, zebrafish.