Figure 1.

Primary structures of guanylin, uroguanylin, and bacterial ST peptides. Single letter abbreviations for the amino acids are used. The peptides are aligned using the conserved cysteine residues found in the three classes of peptides. Sequences for Zebrafish and Fugu peptides were derived from their respective genome sequencing projects, and those for eel peptides were taken from Yuge et al. (17).