Name the protein found in RBCs.

Explanation

**Step-by-Step Solution:**

1. **Identify the Subject**: The question asks for the protein found in Red Blood Cells (RBCs).

2. **Define RBCs**: RBCs, or Red Blood Cells, are the cells in the blood responsible for transporting oxygen from the lungs to the rest of the body and returning carbon dioxide from the body back to the lungs.

3. **Identify the Protein**: The main protein found in RBCs is Hemoglobin.

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