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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 825 Sporosarcina B03.353 Firmicutes B03.353.250 Acidaminococcus B03.353.500 Bacillales B03.353.500.050 ... Heli cal Rods B03.440.425.410.073 Acidaminococcus B03.440.425.410.145 Anaerobiospirillum B03.440. ...