	Although PSMs are present in every "Staphylococcal" species, there is still diversity. "Staphylococcus aureus" encodes eight different PSMs, PSMα 1-4, PSMβ 1-2, PSMγ (Also known as δ-toxin in "S. aureus"), and PSM-mec. While "Staphylococcus epidermidis" encodes one PSMα, PSMβ 1-2, PSMγ, and PSM-mec. In addition "S. epidermidis" encodes two unique PSMs, PSMδ and PSMε. 