CD33 and rheumatoid arthritis: Kurkó et al. reported that MDSCs were present in the synovial fluid (SF) of RA patients [38], and that while CD11b+CD33+HLADRlo/−CD14−CD15+ G-MDSC-like cells were predominant, there was also a small CD11b+CD33+HLA-DRlo/−CD14+CD15− monocytic subset.