Bone-forming protein

特許 係属中 Disclosed is a composition which can regulate the activity of a bone-forming protein involved in the formation of a bone tissue or a cartilage tissue. Specifically disclosed are: a regulator of the activity of a bone-forming protein, which comprises a sulfated galactosaminoglycan having 0.6 piece or more ester sulfate group on average per one constituent monosaccharide or a salt thereof as an active ingredient.