Amino acid sequences of several fragments of the 25k protein (molecular mass 24 953 Da) previously isolated from cobra Naja kaouthia (Kukhtina et al., Bioorg. Khim., 2000, vol. 26, pp. 803-807) were determined. Their comparison with the primary structures of known proteins showed that the 25k protein belongs to the CRISP family and is the first protein of this type identified in cobra venoms.