What is the number of amino acids in an insulin molecule?

A. 41
B. 21
C. 51
D. 22

Insulin is composed of two peptide chains referred to as the A chain and the B chain. A and B chains are linked together by two disulfide bonds, and an additional disulfide is formed within the A chain. In most species, the A chain consists of 21 amino acids, and the B chain of 30 amino acids.  acids are present in insulin. 
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