Who suggested a-helix structure of proteins?

Explanation

To answer the question "Who suggested the alpha-helix structure of proteins?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Alpha Helix Structure**:
- The alpha helix is a common structural motif in proteins. It is characterized by a coiled or spiral shape, which is stabilized by hydrogen bonds between the backbone atoms in the polypeptide chain.

2. **Historical Context**:
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