Tracings of in vitro platelet aggregation obtained at the end of eltrombopag treatment in patients with mutations of MYH9 protein affecting the tail or the motor domain of the molecule. (A) Mutations of MYH9 protein affecting the tail (patient no. 5 in Table 2). (B) Mutations of MYH9 protein affecting the motor domain of the molecule (patient no. 1). Arrows indicate the addition of the stimulating agents reported beside the tracings.