PMAIP1 (Phorbol-12-Myristate-13-Acetate-Induced Protein 1): PMAIP1, also known as Noxa, is a pro-apoptotic protein that plays a crucial role in regulating programmed cell death (apoptosis). It functions within the intrinsic apoptosis pathway and helps initiate cell death in response to cellular stress. PMAIP1 has significant implications in cancer therapy, as its activation can enhance the sensitivity of cancer cells to apoptosis-inducing treatments.