CD83 and rheumatoid arthritis: Fluorescence-activated cell sorting analysis indicated that both CD1c+/CD11c+ mDCs and CD303 (BDCA-2)+/CD123+ pDCs from PsA PB and RA PB displayed an immature phenotype similar to mDCs and pDCs isolated from healthy controls (Figure 3a,b, respectively), with absent expression of the maturation marker CD83 and low to absent expression of CD40, CD80 and CD86 and the chemokine receptor CCR7.