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Table 1. Histochemical Staining Patternsa

 M0 AML, APL (M1-M3)  AMML (M4) AMoL (M5) AEL (M6) AMKL (M7) ALL 
Nonspecific esterases
Alpha-naphthol acetate--+ b+ b-± b-
Sudan Black B-++----

AEL = acute erythroid leukemia; ALL = acute lymphoblastic leukemia; AML = acute myeloid leukemia; AMKL = acute megakaryocytic leukemia; AMML = acute myelomonocytic leukemia; AMoL = acute monocytic leukemia; APL = acute promyelocytic leukemia; PAS = periodic acid-Schiff.
aRefer to the French-American-British (FAB) Classification for Childhood Acute Myeloid Leukemia section of this summary for more information about the morphologic-histochemical classification system for AML.
bThese reactions are inhibited by fluoride.