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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Bile A12.200.147 Cerumen A12.200.194 Colostrum A12.200.250 Dander A12.200.307 Gastric ... 050.150.900.649.313.500.380.271 Cattle B01.050.150.900.649.313.500.380. ...