How are oncogenic viruses different from proto-oncogenes ?

Explanation

To understand how oncogenic viruses differ from proto-oncogenes, we can break down the concepts step by step:

### Step-by-Step Solution:

1. **Definition of Oncogenic Viruses**:
- Oncogenic viruses are specific types of viruses that can cause cancer in host organisms. They achieve this by infecting normal cells and altering their genetic material, leading to uncontrolled cell division and tumor formation.

2. **Definition of Proto-oncogenes**:
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