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Classification of acute leukemia in the United States relies on two main systems, the FAB (French American British) and the WHO (World Health Organization) classifications. In order to diagnose acute leukemia, the FAB system requires ______% of non-erythroid blasts to be present in the bone marrow/peripheral blood, while the WHO system requires the presence of ________% non-erythroid blasts.

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In order to diagnose acute leukemia, the FAB system requires 30% of non-erythroid blasts to be present in the bone marrow/peripheral blood, while the WHO system requires the presence of 20% non-erythroid blasts.
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