Expression levels of FLOT1 and FLOT2 during A. phagocytophilum infection in human promyelocytic leukemia (HL-60) and monkey endothelial (RF/6A) cell lines were measured by quantitative reverse transcription-PCR (qRT-PCR) and Western blotting. The gene discussed is FLOT1; the disease is acute promyelocytic leukemia.