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Material Type---An attribute for the source name or sample name (for example, biospecimen, nanoparticle sample, small molecule etc.). 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 source name and sample name. The term for each characteristic characteristics [ ] attribute is written within brackets (for example, Characteristic Characteristics [organism], Characteristic Characteristics [cell type], etc.).

Provider---An attribute for source name, which refers to the name of the person or the vendor providing the source sample.

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