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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Animals, Exotic B01.050.050.136 Animals, Genetically Modified B01.050.050.136.500 Mice, Transgenic B01. ... 510.956 Vegetables B01.650.520 Plants, Genetically Modified B01.650.560 Plants, Medicinal B01.650.660 ...