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Material Type---An attribute for the sample name (for example, biospecimen, nanoparticle sample, small molecule etc.) if the same attribute is not given in the Study file. The term can be a free-text description or taken from an ontology or a controlled vocabulary. If it is the latter, then the following qualifiers are used: term accession number and term source REF.

Characteristic Characteristics [ ]---An attribute for sample name if the same attribute is not given in the study file.

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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 type, characteristic characteristics [ ], parameter value [ ], measurement value [], unit or factor value [ ] columns.

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