Vitronectin (54 kDa), along with fibrinogen and fibronectin, facilitates cell attachment to surfaces . Despite the similar plasma concentrations, vitronectin exhibits a higher propensity for surface binding in comparison to fibronectin and fibrinogen . As foundin previous studies, where vitronectin was obtained in minimal intensities , the present study also detected low amounts of vitronectin, with a step increase upon UTX addition.