Platelet aggregation tracings starting with the addition of CaCl₂ and MgCl₂ to a final concentration of 2 mmol/L to platelet-rich plasma, either without addition, with incubation with 20 μmol/L ADP (as positive control), or with 0.1 μg/mL c7E3. c7E3 samples were additionally preincubated with either 100 μg/mL aspirin, 10 μmol/L indomethacin, 100 nmol/L PGI₂, or 20 μg/mL MoAb P2. Representative tracings of several experiments as determined by increase of light transmission in a Bio/Data PAP4 aggregometer are depicted.