observations on the effects of uv irradiation on the thrombic fragments of calmodulin and on related calcium binding proteins ( rabbit skeletal muscle troponin c , bovine cardiac troponin c , and parvalbumin ) support the interpretation that dityrosine formation in calmodulin results from the intramolecular cross-linking of tyr-99 and tyr-138 .
C0006732
calcium
C0077400
troponin c