Poisonous agglutinin from beans. A polypeptide composed of glutamic acid, aspartic acid, serine, alanine, tyrosine, lysine and arginine: Piekarski, Diss. Pharm. 9, 255 (1957), C.A. 52, 6456i (1958). Prepn: Wienhaus, Biochem. Z. 18, 228 (1909), C.A. 3, 2471 (1909); Piekarski, loc. cit.