p21 protein

p21 is a protein that helps regulate how cells grow and divide. It acts as a kind of brake, stopping cells from multiplying too quickly, especially when there’s DNA damage or stress. This control is important for preventing uncontrolled cell growth, which can lead to cancer. p21 works by blocking certain proteins that promote cell division, allowing repair or protecting cells from becoming abnormal. Overall, p21 plays a critical role in maintaining healthy cell function and preventing disease through its regulation of cell cycle progression.