Figure 2 .
(A) Genomic structure of GsdfY and GsdfX. Two synonymous substitutions are present in exon 3. Open boxes, exons. Horizontal bars, introns. Numbers represent nucleotide sequence length (bp). Open arrowheads indicate the translation start (ATG) and stop (TGA) sites. (B) Amino acid sequences of Gsdf. GsdfY and GsdfX are the same. Signal peptide is indicated in italics. The six conserved cysteine residues are underlined. (C) Neighbor-joining (NJ) tree for the TGF-β superfamily using the amino acid sequence of the mature domain. The tree was rooted by using BDNF.