Name the protein found in A-band and l-band of a myofibril.

Explanation

To answer the question about the proteins found in the A-band and I-band of a myofibril, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Myofibrils**: Myofibrils are the basic rod-like units of a muscle cell, responsible for muscle contraction. They are composed of repeating units called sarcomeres.

2. **Identifying Bands in Myofibrils**: In a sarcomere, there are distinct regions known as A-band and I-band. The A-band is the dark band, while the I-band is the light band.

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