Which protein serves as a chemical messenger? a. hemoglobin b. actin c. myosin d. insulin

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Which protein serves as a chemical messenger? a. hemoglobin b. actin c. myosin d. insulin

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I would also agree that insulin is the answer

insulin is called endocrine insulin. Hormones are produced by the endocrine glands. Insulin is a protein made by the beta cells, which is found in the pancreas. The main function of beta cells is to store and then release insulin.

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