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Sequences of neuropeptides. The neuropeptides NPK, NKG, NKA, NKB, and SP are part of the subfamily of tachykinins. The tachykinins consist of the conserved C-terminal sequence F-X-G-L-M, where X = F, Y, V, I. Some of the tachykinins have high similarity and identity along the sequence. NPW and NPY are rich in Trp and Tyr amino acids, respectively.
