LILRB1 and acute lymphoblastic leukemia: To generate LILRB1 CAR-T cells and select LILRB1-specific single-chain variable fragments (scFv), we screened various clones of murine anti-LILRB1 monoclonal antibodies (mAbs) in B-ALL cell lines exhibiting various levels of LILRB1, ultimately choosing two clones: HP-F1 and #292305 (Supplementary Fig. 5A).