Bone marrow evaluation of a thrombocytopenic member.

Bone marrow aspirate and biopsy specimen were obtained from II-4 as part of his normal medical care. (A) Biopsy specimen; original magnification, 100 ×. (B-D) Typical megakaryocytes identified from bone marrow aspirate; original magnifications, 200 × (B), 500 × (C), 1000 × (D). (E) Erythroid precursors in bone marrow aspirate; original magnification, 1000 ×.