ART4 and autoimmune thrombocytopenic purpura: In ITP, key platelet receptors, including glycoprotein (GP) Ib‐IX‐V complex, GPV, GPVI and integrins αIIbβ3 and α2β1, are targeted by anti‐platelet autoantibodies7 which can mediate platelet activation via fragment crystallisable (Fc)‐dependent and ‐independent means.8