This peptide was originally isolated from the egg jelly of the sea urchin, Glyptocidaris crenularis. It causes significant increases of sperm respiration rates and sperm cyclic nucleotide concentrations. Suzuki, N; et al., Comp. Biochem. Physiol. C, 90, 305, (1988); Yoshino, K; et al., FEBS Lett., 294, 179, (1991); Suzuki, N; Yoshino, K., Comp. Biochem. Physiol. B, 102, 679, (1992).
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