Final answer:
Anti-apoptotic Bcl2 proteins contain BH proteins, which play a role in regulating programmed cell death or apoptosis.
Step-by-step explanation:
Anti-apoptotic Bcl2 proteins contain BH proteins. BH proteins are a group of proteins that play a key role in regulating programmed cell death, also known as apoptosis. The Bcl2 proteins are divided into three main groups based on their structure and function: the anti-apoptotic proteins, the pro-apoptotic proteins, and the BH3-only proteins. The anti-apoptotic Bcl2 proteins, such as Bcl2 itself, contain multiple BH domains, which are responsible for their anti-apoptotic activity.