Figure 4. Attachment of extracellular matrix and blood plasma proteins to control and test surfaces (n = 3 in each group, performed in triplicate). Purified albumin, fibronectin, or collagen type I were allowed to attach to surfaces for 16 h at 37 ˚C. Relative binding was measured by electrophoresis followed by Coomassie blue staining or immunoblotting of solubilized proteins (A). Significant differences by densitometry (B - D) using paired Student’s t-test (P ≤ 0.05) are indicated (*).