What are building blocks of proteins ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Proteins**: Proteins are large biomolecules that play critical roles in the body, including structural, functional, and regulatory roles.

2. **Identifying Building Blocks**: The building blocks of proteins are known as amino acids. These are the fundamental units that combine to form proteins.

3. **Structure of Amino Acids**: Each amino acid has a basic structure that includes:
- An amino group (-NH2)
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