Caspases (Pro-apoptotics) Initiator caspases: Executioner caspases: 3 and 7 Pro-apoptotic genes Mnemonic: “B” followed by a vowel Anti-apoptotic genes Mnemonic: Contains “L” or “XL” Other: Inhibitor of Apoptosis (XIAP) How all these genes and molecules work together to complete apoptosis? Find it here.