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The neuropeptide Phe-Met-Arg-Phe-NH2 (FMRFamide) is a potent cardioactive neuropeptide in Lymnaea stagnalis. Isolation and sequencing of 2 cDNAs and a genomic clone shows that a single gene encodes a precursor protein which contains 9 copies of the FMRFamide peptide, 2 copies of the related peptide Phe-Leu-Arg-Phe-NH2 (FLRFamide), and single copies of the putative pentapeptides Gln-Phe- Tyr-Arg-lle-NH2 (posttranslationally modified to pQFYRlamide) and Glu- Phe-Leu-Arg-lle-NH2 (EFLRlamide). The gene is transcribed in the CNS and gives rise to a single RNA of 1.7 kb in size. The organization of the Lymnaea gene is significant with respect to the evolution of FMRFamide and related peptides in other organisms.

the journal of neuroscience/the journal of neuroscience

Cardioactive neuropeptide Phe-Met-Arg-Phe-NH2 (FMRFamide) and novel related peptides are encoded in multiple copies by a single gene in the snail Lymnaea stagnalis