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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 811.464.259.400 Carbon-Nitrogen Ligases with Glutamine as Amide-N- Donor D08.811.464.259.400.300 Carbamoyl-Phosphate Synthase (Glutamine-Hydrolyzin g) D08.811.464.259.550 Formate- ...
  2. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... UNWINDING PROTEINS DNA RESTRICTION ENZYMES ENDONUCLEASES EXONUCLEASES DEOXYRIBONUCLEASES GLUTAMINE SYNTHETASE PEPTIDE SYNTHETASES PEPTIDYL TRANSFERASES POLYNUCLEOTIDE SYNTHETASES POLYDEOXYRIBONUCLEOTJDE ...