Used in immunological research to study T-cell and NK-cell development and function. Serves as a detection target in assays due to the His tag, enabling easy purification and identification. Applied in the development of therapeutic antibodies targeting CD7-positive cells, particularly in T-cell and NK-cell malignancies. Supports cell surface marker analysis in flow cytometry and immunoassays. Facilitates protein-protein interaction studies in signaling pathways related to immune response. Also utilized in vaccine development for immune-related conditions.