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Primary structure of cat osteocalcin.

A bone Gla-containing protein (osteocalcin) of cat has been isolated and the complete primary structure has been determined to be YLAPGLGAOAPYPDPLXPKRXICXLNPDCDELADHIGFQDAYRRFYGTV. The protein consists of 49 amino acid residues (Mr. 5,641) containing three Gla residues and a single disulfide bond. Although the C-terminal 30 residues (20th to 49th) of the sequences of cow, monkey, and human osteocalcins are identical, three amino acid substitutions occur at positions 22, 40, and 48 in the case of cat. These substitutions can be explained by single point mutations.