Myoactive tetradecapeptides family
This family consists of myoactive tetradecapeptides that are isolated from the gut of earthworms, Eisenia foetida and Pheretima vitata. These peptides were termed ETP and PTP respectively. Both peptides showed a potent excitatory action on spontaneous contractions of the anterior gut. These peptides show similarity to Molluscan tetradecapeptides and arthropodan tridecapeptides.
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