Next, we screened a panel of human leukemic AML cell lines (OCI-AML3, OCI-AML5, Mono-Mac-6, KG1, Kasumi-1, NB-4, MV-4/11, Molm-13, HEL, CMK, Mo7E, HL60) for FLT3 protein basal expression, which was not detectable in most of the cell lines. Here, FLT3 is linked to acute myeloid leukemia.