passages.id: split_8_test_1406_passage
passages.type: progene_text
passages.text: The complete amino acid sequence of protease inhibitor BWI-4a from buckwheat ( Fagopyrum esculentum Moench ) seeds , consisting of 67 amino acid residues with a single disulfide bond , has been established by Edman degradation in combination with matrix - assisted laser desorption ionization time - of - flight mass spectrometry .