Bone marrow morphology before and after transplantation in patients 2 and 3. (A-B) Bone marrow of patient 2 prior to conditioning (original magnification, × 20 [A]; × 100 [B]). The marrow is normocellular with an abundance of hematopoietic precursors. (C-D) Bone marrow at day 46 after transplantation (original magnification, × 20 [C]; × 100 [D]). The marrow is profoundly hypocellular. The only nucleated elements are residual plasma cells. (E-F) Bone marrow of patient 3 prior to conditioning (original magnification, × 20 [E]; × 100 [F]). The marrow is normocellular with an abundance of hematopoietic precursors. Notice also the presence of nodular lymphoid infiltrates (arrow). (G-H) Bone marrow of patient 3 at day 26 after transplantation (original magnification, × 2 [G]; × 100 [H]). The marrow is profoundly hypocellular. Hematoxylin and eosin stain was used for each panel.