Fig. 1.

Three classes of myomodulin cDNA fromLymnaea stagnalis. a, Schematic diagram of a class III myomodulin cDNA, indicating the position of the untranslated regions (white bars) and the open reading frame (hatched bar). The position of the EcoRI restriction site (E) at 826 bp is shown. The three alternative polyadenylation signals used in the three classes of cDNA are marked with arrows and the base position in the complete nucleotide sequence (b). b, The complete nucleotide sequence of a class III myomodulin cDNA. The deduced sequence of the precursor protein encoded by the open reading frame (588–1637 bp) is also given; the amino acid residue positions areunderlined on the right. The stop codon is shown as an asterisk. The three polyadenylation signals arebold and underlined, and the polyadenylation sites are marked by vertical lines. Thearrowhead at 645 bp marks the position at which the intron lies within the gene. Potential peptides within the opening reading frame are underlined.