What role does p53 play in the G1 phase, and why is it significant in cancer research?

• A. p53 directly repairs DNA damage.
• B. p53 detects DNA damage and can halt the cell cycle, preventing damaged cells from dividing.
• C. p53 is responsible for initiating apoptosis in healthy cells.
• D. p53 promotes the transition from G1 to S phase.

Answer: (B)