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Characteristics of the completed rheumatoid arthritis (RA) clinical trials. (A) RA disease status of patients; (B) major histocompatibility complex (MHC) context (C) MSC tissue source. Umbilical cord (UC-MSCs), adipose tissue (AD-MSCs), and bone marrow (BM-MSCs); (D) number of doses and (E) MSC dose expressed as number of cells/kg of body weight (1–10 × 106 or >10–50 × 106). Data are represented as percentage of the total number of studies.
