FcɛRI-mediated RANTES release from human platelets. Human platelets (1 × 10⁸/mL) were stimulated with mouse MoAb to human FcɛRI  chain (CRA1 at 100 μg/mL), or with thrombin (1 U/mL). The levels of released RANTES were measured by ELISA. Spontaneous release was always <1% of the total RANTES content. Results are shown as mean ±SD (n=3). * P < .01.