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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 015.611.773 Retinal Vein A07.015.700 Tunica Intima A07.015.700.500 Endothelium, Vascular A07.015.700.750 Pericytes A07.015.733 Tunica Media A07.015.733.500 Muscle, Smooth, Vascular A07.015.765 Vasa Nervorum A07.015.836 ...