Rimorphin, a unique, naturally occurring [Leu]enkephalin-containing peptide found in association with dynorphin and alpha-neo-endorphin.

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Abstract
The tridecapeptide NH2-Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Gln-Phe-Lys-Val-Val-Thr-COOH was purified from extracts of bovine posterior pituitary glands. This unique peptide, which was given the name rimorphin, is a major [Leu]-enkephalin-containing peptide in all tissues examined that contain dynorphin and .alpha.-neo-endorphin. However, except for the initial hexapeptide sequence, it is structurally unrelated to the other 2 peptides.