Bone marrow cellularity in patients 1 and 2. The left panels (for both Patients 1 and 2) show cellularity in these robust responders at baseline. The middle panels show cellularity just prior to discontinuing eltrombopag. The right panels demonstrate that, for Patients 1 and 2, the marrows remain cellular. The images were taken on an Olympus BX41 microscope with an Olympus DP72 camera, using a 4× UPlanFL N Olympus objective (original magnification ×40).