Which peptide chain is removed during maturation of proinsulin

Explanation

**Step-by-Step Solution:**

1. **Understanding Proinsulin**: Proinsulin is a precursor molecule to insulin. It is a single polypeptide chain that consists of three segments: the A chain, the B chain, and the C-peptide.

2. **Structure of Proinsulin**: The proinsulin molecule contains two main components, which are the A and B chains, that are connected by the C-peptide. The A chain and B chain are essential for the biological activity of insulin.

3. **Maturation Process**: During the maturation of proinsulin, the molecule undergoes a conversion process to become active insulin. This process involves the cleavage of the C-peptide.

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