	While the α-type PSMs are regarded as major cytolysins, the β-type PSMs are though to play a role in biofilm formation. "S. epidermidis", which is a known opportunistic pathogen, has a high level of β-type PSM expression. In addition "in vitro" measurement of PSMβ expression in "S. epidermidis" has shown to be increased in biofilm as opposed to planktonic growth, further suggesting a link between PSMβ and biofilm formation. Altering the structure of PSMβ has been demonstrated to disrupt their ability to influence biofilm formation.