However, similar to that of the PBS group, the ratio of CD45R+ B cells of the BMABIhighMFGE8high group was dramatically higher than that of the MSC or non‐BMABIhighMFGE8high group in the SLE mice (Figure 6F), possibly failing to suppress overactive Ig antibody production. Here, PTPRC is linked to systemic lupus erythematosus.