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Unit---The standard of measurement used if the values for characteristic [ ] columns are quantitative and dimensional. If the term for unit is taken from an ontology/controlled vocabulary, then its term accession number and the term source REF should be defined in the ISA-TAB-Nano material fileMaterial File.

Term Accession Number---Identification number of a term selected from an ontology or a controlled vocabulary, if the term is entered as a value in material intended application, material type, material chemical name, characteristic [ ], material linkage type [ ], material data file type [ ], unit or factor value [ ] columns.

Term Source REF---The name which identifies the source from where a term is selected and entered in ISA-TAB-Nano study files. This name should match one of the names entered in the term source name field in the ISA-TAB-Nano Investigation fileFile.

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