Serum levels for 8-iso-PGF2α (A), IPF2α-I (B), and thromboxane B2 (C) at 10 and 5 days before aspirin (−10, −5), immediately before aspirin (day 0) (Base), and after 10 days of aspirin intake (ASA). After a 2-week washout, levels were measured after 2-hr indomethacin (INDO) intake.