Name various cellular barriers of innate immunity.

Explanation

### Step-by-Step Solution:

1. **Understanding Innate Immunity**:
- Innate immunity is the natural defense system that a person is born with. It provides immediate protection against pathogens (disease-causing organisms) without the need for prior exposure.

2. **Identifying Cellular Barriers**:
- Cellular barriers are specific types of cells involved in the innate immune response. These cells play a crucial role in identifying and eliminating pathogens.

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