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A serine endopeptidase (SEP) was found to be possibly involved in the degradation of storage proteins in cotyledons of germinated Vigna mungo seeds. SEP activity was separated into two isoforms by CM-cellulose column chromatography. These forms, termed SEP-1 and SEP-II, showed endopeptidase activities even at acidic pH, suggesting that SEPs are unique serine endopeptidases, since most serine proteases are optimum at neutral pH.