Write the name of linkage joining two amino acids.

Explanation

To answer the question regarding the linkage that joins two amino acids, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Functional Groups of Amino Acids**:
- Amino acids contain two main functional groups: an amino group (-NH2) and a carboxylic acid group (-COOH).

2. **Write the Basic Structure of an Amino Acid**:
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