Staphylococcus aureus alpha toxin
Alpha-toxin, also known as alpha-hemolysin (Hla), is the major cytotoxic agent released by bacterium Staphylococcus aureus and the first identified member of the pore forming beta-barrel toxin family. This toxin consists mostly of beta sheets (68%) with only about 10% alpha helices.
Source: Wikipedia — Staphylococcus aureus alpha toxin (CC BY-SA 4.0)