To identify the potential interacting protein of LILRB1 in multiple myeloma cell line ARP-1,we used anti-IgG antibody and anti-LILRB1 antibody to do pull down in ARP-1 cell lysate and sent the pull-down products for mass spectrum analysis.By comparing the pull-down results of anti-LILRB1 antibody and anti-IgG antibody, we identify potential interacting proteins of LILRB1.