SEM demonstrates that RGDW inhibits platelet-platelet interactions, but not platelet interactions with polymerizing fibrin in the DW. Representative SEM images of washed platelets (2 × 10⁸/mL) stimulated in the aggregometer with the indicated agonist, with or without pretreatment with 150 μM RGDW. (A) Samples fixed 30 seconds (top row) or 2 minutes (lower row) after initiation of aggregation or onset of the DW. (B) Samples fixed 4 minutes after activation with Thr alone (left 2 panels) or Thr with RGDW (right 2 panels).