Isolation and amino acid sequence analysis of a 4,000-dalton dynorphin from porcine pituitary.

Abstract
A 4000-dalton dynorphin was isolated from porcine pituitary. It has 32 amino acids (MW = 3986), with the previously described heptadecapeptide (now called dynorphin A) at its amino terminus and a related tridecapeptide, dynorphin B, at its carboxyl terminus. The 2 peptides are separated by the processing signal Lys-Arg.