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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... B03.510.100.800 Thermoactinomyces B03.510.400 Gram-Positive Cocci B03.510.400.030 Aerococcus B03.510.400. ...