Keratin, fibroin and collagen are fibrous proteins.

Explanation

**Step-by-Step Solution:**

1. **Understanding Fibrous Proteins:**
- Fibrous proteins are characterized by their elongated, fiber-like structures. They are typically insoluble in water and have a structural role in organisms.

2. **Identifying the Types of Fibrous Proteins:**
- Common examples of fibrous proteins include keratin, fibrin, and collagen. Each of these proteins has distinct functions but shares the common characteristic of being fibrous.

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