Incubation of platelets from a control donor (A and B) and a patient with Glanzmann’s thrombasthenia (C) with abciximab in vitro. Platelets were fixed after 1-minute (A) or 1-hour staining (B and C). Arrows highlight the presence of gold particles within the thin channels of the SCCS, arrow heads indicate gold particles associated with -granules. In (C) almost no labeling was seen. Bars = 0.2 μm.