Evaluation of a New Vasculature by High Resolution Light Microscopy:   Primo Vessel and Node
  The primo vascular system is composed of nodes and vessels. The bundle of sub-vessels of the promo vessel is laid into an external jacket composed of endothelial cells. The node is heterogeneous in nature, composed of twisted sub-vessel bundles that fill up nearly the entire node volume. The enlarged sub-vessel inside the node harbors microcells that express stem cells and stem cells niche markers. We conclude that these microcells are progenitors of multipotent stem cells and the nodes serve as the stem cell niches outside the bone marrow. 
Vitaly Vodyanoy, Oleg Pustovyy, Ludmila Globa, and Iryna Sorokulova
q-bio.TO