Effect of VBL on the adhesion of HUVEC on the FN substrate. The cells were incubated for 90 minutes in the specific growth medium without FCS (positive control) and in this medium containing each VBL dose. The attachment to and the spreading on FN were assessed at 30 minutes and 90 minutes, respectively. Bars represent the mean ± 1 SD in 1 representative experiment out of 6. Significance by the Wilcoxon rank test.