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  1. pdf2018MeShTreeHierarchy.pdf 
    https://www.nlm.nih.gov/mesh/2018/download/2018MeShTreeHierarchy.pdf
    ... 800.575.912.250.618.100.060.400...........................................Hyacinthus B01.650.940.800.575.912.250.618. ... Blood Preservation E02.792.833.230.500...........................................Blood Safety E02.792.833.660...........................................Organ Preservation E02.792. ...