biosample_substance.tsv

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Association between a biosample and a substance of interest

If populated, biosample_substance.tsv will contain one row for every biosample linked to a PubChem substance experimentally associated it. This field is meant to be used for biosample studies analyzing toxins or drugs; bench trials of chemicals on tissue samples; and any other use cases that tie a small number of substances to a biosample.

All fields are required: this table can be empty (header-row only), but any non-header rows must leave no fields blank.

Some examples:

• If you don't have any biosamples associated with substances, this table should be left empty.
• If you have exactly one substance of interest for each biosample, this table will have the same number of rows as biosample.tsv
• If you have two substances especially relevant to each biosample, this table will have twice as many rows as biosample.tsv

Field	Field Description	Required?	Field Value Type	Extra Info
biosample_id_namespace	Identifier namespace for this biosample	Required	string	This will be the value of id_namespace in the row in biosample.tsv corresponding to the biosample referenced in this row. If your program has not registered multiple CFDE identifier namespaces, this will be exactly the same value for all rows.
biosample_local_id	The ID of this biosample	Required	string	This will be the value of local_id in the row in biosample.tsv corresponding to the biosample referenced in this row.
substance	A PubChem substance ID (SID) describing this substance	Required	string	This must be a valid PubChem ID Example: 5381226

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