(A) Confocal microscopy of pLNs of Lyve1;tdTomato reporter mice for tdTOMATO+ (LYVE1-) expressing cells (red), PNAd+ (green) HEVs and Lyve-1+ (blue) LECs. (B) FACS analysis of CD45-/CD31+/PNAd+/Lyve-1- high-endothelial cells and CD45-/CD31+/PNAd-/Lyve-1+ LECs isolated from pLNs of tdTomatoSTOP-loxP control mice or Lyve1;tdTomato mice for tdTOMATO expression. (C) FACS analysis of CD45-/CD31+/PNAd+/Lyve-1- high-endothelial cells and CD45-/CD31+/PNAd-/Lyve-1+ LECs of pLNs of Spns2f/f and Lyve1;Spns2Δ/Δ mice. (D) Quantitative RT-PCR analysis of Spns2 mRNA in sorted LECs, HEVs (as in C) and of whole blood from Spns2f/f and Lyve1;Spns2Δ/Δ mice. (E) Confocal microscopy of whole mounts of iLNs isolated from embryos of E16.5 (top) and E18.5 (bottom) of WT C57BL/6 mice for MAdCAM-1 (green), PNAd (red) and Lyve-1 (blue) on high-endothelial cell progenitors and HEVs. Scale bars, 200 μm (A, left), 50 μm (A, right) and 20 μm (D). Data are representative for three mice per group (A), or are representative for two individual experiments (B–D) of pooled non-hematopoietic cells from 2x pLNs, 2x iLNs, 2x aLNs, 2x bLNs, 6x cervical LNs collected from five mice per group (B–D), or are representative for five analyzed embryos per group (E).