Aggregation to ADP and adrenaline in 2 participants diagnosed with a Gi-like defect. Aggregation in 2 participants (p) diagnosed with a Gi-like defect is shown. The participant in panel A shows a partial primary wave response to adrenaline, whereas for a second participant shown in panel B, the primary wave is absent. “c” indicates the control (healthy volunteer). Note that the biphasic aggregation to ADP shown in panel B would eventually decline. The patterns of aggregation are representative of other participants diagnosed with a Gi-like defect.