Dose-effect of P. noctiluca venom and its fractions (F1- F4) on U87 cell adhesion to fibrinogen. N = 4 (at least). Cell adhesion towards fibrinogen was performed in the presence of the indicated concentrations of P. noctiluca venom and its fractions (F1- F4). Data shown (± SD) are from one experiment representative of three performed in triplicate. * indicates statistically significant differences (p < 0.05) compared with the control (untreated cells).