Write the difference between :
Actin and myosin

Explanation

### Step-by-Step Text Solution:

1. **Definition and Structure**:
- **Actin**: Actin is a thin, low molecular weight filamentous protein found in the sarcomere, which is the basic unit of muscle contraction.
- **Myosin**: Myosin is a thick, high molecular weight filamentous protein also present in the sarcomere.

2. **Forms**:
- **Actin**: Actin exists in two forms:
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