Fig. 3. Coulter multisizer percentages of total platelets appearing as singlets under the four experimental conditions for each of the three surfactants studied using recalcified platelet-rich plasma. Surfactants were Dow Corning Antifoam 1510US, Perftoran, and Pluronic F-127. * P < 0.05 compared with other conditions within the same surfactant group (n = 8/group).