There was one final function attributed to Sbp and biofilm formation. It affected the production of another major component of S. epidermidis biofilms, polysaccharide intercellular adhesin, or PIA. This molecule is involved in giving the biofilm both elasticity and a stable, three-dimensional shape. When Sbp was present, the PIA concentration was normal; when the small protein was absent, PIA levels decreased. This suggested not only was Sbp linked genetically to PIA but also was involved in maintaining the biofilm matrix. In essence, Sbp was not only a cornerstone but also a lynchpin.