Used in immunological research to study hematopoietic stem cell development and acute myeloid leukemia (AML) progression. Serves as a target antigen in immunoassays and flow cytometry to detect and quantify FLT3 expression on cell surfaces. Supports drug development by enabling binding studies with therapeutic antibodies or small molecules targeting FLT3 signaling pathways. Facilitates protein-protein interaction experiments due to the His tag, allowing easy purification and detection in recombinant systems.