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Morphological features of MuLV Gr-1.4-induced leukemia. Micrographs were taken with a Zeiss Axioscope microscope (magnification, ×1,000). Morphological subtypes were lymphoblasts (I); mixed erythroblasts, myeloblasts, and lymphoblasts (II); myeloblasts (III); myelo-monoblasts (IV); and erythroblasts (V).
