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Representative lymphatic vessels labeled for lymphatic marker, Prox-1, LYVE-1, or Podoplanin (Pdpn), plus PECAM. The lymphatic markers did not label a subset of blind-ended lymphatic endothelial cell segments (arrows) structurally similar to blood capillary sprouts. These blind-ended lymphatic endothelial cell segments originated from initial lymphatics (L) with positive lymphatic marker labeling. Scale bars, 20 μm.
