NK cells and pDCs colocalize in T-cell areas of normal human tonsils. (A-C) Double-staining of BDCA-2 (red) and CD56 (blue), showing CD56⁺ NK cells located in close association with BDCA-2⁺ pDCs in T-cell areas of human inflamed tonsils. Original magnifications, × 10 (A), × 20 (B), and × 40 (C). (D-F) Double-staining of BDCA-2 (red) and GITRL (green), showing a subpopulation of BDCA-2⁺ pDCs expressing GITRL. Original magnification, × 60 objective.