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Unit---The standard of measurement used if the values for characteristic [ ], parameter value [ ] or factor value [ ] 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 investigation fileStudy 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 source name, material type, characteristic [ ], parameter value [ ], unit or factor value [ ] columns.

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