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Different effects of Aminopeptidase N (APN) inhibitors on the enzyme activity of APN of HL‐60 cells and the viability of K562 cell line. (a) The enzyme activity was estimated by measuring the absorbance at 405 nm, as the substrate was L‐leucine‐p‐nitroanilide. (b) The effect of APN inhibitors on the viability of K562 cell lines were measured by MTT assay.
