This family contain neuropeptides, isolated from ganglia of the African giant snail, Achatina fulica. Each peptide has a Trp residue at both the N- and C-termini. Purified WWamide-1, -2 and -3 showed an inhibitory effect on the phasic contractions of the anterior byssus retractor muscle (ABRM).
Jiyao W et al.(2023). "The conserved domain database in 2023.",