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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 776.543.750.695.700.700.200.100 Receptor, Adenosine A2A D12.776.543.750.695.700.700.200. ... 776.543.750.720.700.700.200.100 Receptor, Adenosine A2A D12.776.543.750.720.700.700.200. ...