(A, B) Purified human pDCs, (C, D) monocyte-derived cDCs or (E, F) macrophages were purified from human PBMC and the expression of subunits of the (A, C, E) constitutive proteasome PMSB6, PMSB7 and PMSB5 or of the (B, D, F) immunoproteasome PMSB9, PMSB10 and PMSB8 were quantified by qPCR relative to the housekeeping gene UBI. All results are represented as a mean ± SEM and individual donors are shown.