y is pro insulin so called? how is It different from insulin?

Proinsulin is a protein molecule . It is a precursor hormone, or prohormone, to insulin. Insulin is produced by the beta cells,Proinsulin is composed of 86 amino acids. It has three domains, or distinct peptide chains: alpha chain, beta chain, and C-peptide.

Mature insulin is made up of 51 amino acids

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Pro insulin is the inactive form of insulin. It is called so because it has the free C peptide chain.

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