One intracellular calcium-binding protein is A) calmodulin. B) calcitonin. C) calcitriol. D) IP₃. E) nitric oxide.

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Calmodulin is a well-known intracellular calcium-binding protein that regulates a variety of cellular activities, including muscle contraction, neurotransmitter release, and gene expression. The other options are either hormones or molecules that are not primarily associated with calcium binding.

One Intracellular Calcium-Binding Protein Is