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Unit---The standard of measurement used if the values for characteristic [ ], parameter value [ ], factor value [ ], or measurement 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 fileAssay 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 [ ], factor value [ ], measurement value [], unit, or statistic 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 fileInvestigation File.

Other Assay Fields

Factor Value [ ]---The value of an independent variable manipulated by the experimentalist with the intention to affect the subject of study (that is, stressor). Factor terms are given in brackets, and must be defined in the ISA-TAB-Nano investigation file in the STUDY FACTORS section. Factor Value [] in the Assay file should reference technical variations (such as software, instrument or protocol variations).

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