Neutrophils are present in human lymph nodes and express MHCII. (A and B) Quantification of neutrophils in human inguinal, mesenteric, and thoracic (tho) LNs with (A) representative plots and (B) % live neutrophils. (C) Confocal image of human thoracic LN neutrophils. (Scale bars, 20 μm; Z stack, 18 μm.) (D) Confocal image of human mesenteric LN neutrophils. (Scale bars, 40 μm; Z stack, 12 μm.) (E and F) MHCII expression on human LN neutrophils with (E) representative plots and (F) % MHCII+ neutrophils. Data are from 14 donors. (G and H) MHCII expression on unstimulated murine neutrophils with (G) representative plots and (H) % MHCII+ neutrophils; data are from 6 mice in 5 experiments; *P < 0.05, ***P < 0.001 vs. blood. Mean ± SEM is shown.