Comparative mapping of exon boundaries in different fish MSTN-2 genes MSTN-2 genes are organized into three exons. The three adjoining boxes for each protein represent the coding region for each exon. Amino acid sequences coded by exon boundaries are shown inside the boxes. The first amino acid coded by each exon is shown above, as is the last residue of the third exons. In all fish genes, the codon located at the first exonic boundary is partially coded by the first and second exons as shown (residue in red). When the exonic boundary is not known (genomic DNA sequence unknown) the residue is in black. Missing sequences due to partial cds appear in dashed boxes. Asterisks designate stop codon or deletion resulting in non-functional gene. Accession numbers: zebrafish (Danio rerio) MSTN-2, AY687474 (mRNA), DQ451548 (gene); gilthead sea bream (Sparus aurata) MSTN-2, AY046314 (mRNA), GQ379805 (gene, present study); fugu (Takifugu rubripes) MSTN-2, AY445321 (mRNA) ENSTRUG00000000132 (gene); rainbow trout (Oncorhynchus mykiss) MSTN-2a, DQ417326 (mRNA), DQ138301 (gene); rainbow trout (Oncorhynchus mykiss) MSTN-2b, DQ417327 (mRNA); Atlantic salmon (Salmo salar ) MSTN-2a, EF392863 (gene, partial); Atlantic salmon (Salmo salar ) MSTN-2b, EF392864 (gene, partial); large yellow croaker (Pseudosciaena crocea ) MSTN-2, EU571244 (gene); barramundi (Lates calcarifer) MSTN-2, GU590863 (gene); spotted green pufferfish (Tetraodon nigroviridis), MSTN-2, ENSTNIT00000020527 (mRNA), ENSTNIG00000017160 (gene); shi drum (Umbrina cirrosa) MSTN-2, AY059386 (mRNA, partial).