Name the two special proteins which constitute the contractile filaments of a muscle fibre.

Explanation

To answer the question regarding the two special proteins that constitute the contractile filaments of a muscle fiber, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Muscle Structure**: Muscle fibers, particularly in skeletal muscles (also known as striated muscles), are composed of smaller units called myofibrils.

2. **Identify Protein Types**: Each myofibril consists of three types of proteins:
- Contractile proteins
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