Crustacean cardioactive peptide (CCAP) is a highly conserved, amidated cyclic nonapeptide with the primary structure PFCNAFTGC-NH2 (ProPheCysAsnAlaPheTyrGlyCys-NH2) and a disulfide bridge between Cys3 and Cys9. It is found in crustaceans and insects where it behaves as a cardioaccelerator, neuropeptide transmitter for other areas of the nervous system and a hormone.

Ac-g-Endorphin

度洛西汀是一种血清素-去甲肾上腺素再摄取抑制剂（Ki 为 4.6 nM），用于治疗重度抑郁症和广泛性焦虑症。