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Amino acid sequence of a less-cytotoxic basic polypeptide (LCBP) isolated from the venom of the Indian cobra (Naja naja).

A less-cytotoxic polypeptide, designated as LCBP, was isolated from the venom of Naja naja by gel filtration on Sephadex G-50 followed by CM-cellulose chromatography. The cytotoxicity toward Yoshida sarcoma cells and lethal toxicity toward mice of LCBP were both one order of magnitude lower than that of cytotoxins and that of toxin A, respectively. LCBP is a single polypeptide consisting of 61 amino acid residues with four intramolecular disulfide linkages, and the amino acid sequence is the same as that of cardiotoxin-like basic polypeptide (CLBP) isolated from the venom of Naja naja atra. This is the first time that the same polypeptides were isolated from different cobra venoms.