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1. The Related References domain (RELREF) is a relationship dataset used to describe how information is related to the design of the study and to other sources of information within the study.
2. To identify a source of information from a genetic toxicology assay within a study, a unique identifier (REFID) must be assigned

   Jira
   showSummary false server Issue Tracker (JIRA) serverId 85506ce4-3cb3-3d91-85ee-f633aaaf4a45 key TOBA-471

   and populated in all datasets containing the REFID column. In other words, each GTREFID that exists in the GT dataset must exist in the RELREF dataset.  JirashowSummaryfalseserverIssue Tracker (JIRA)serverId85506ce4-3cb3-3d91-85ee-f633aaaf4a45keyTOBA-452
3. Each REFID that exists in the RELREF dataset must exist in the GT dataset. 
4. For each value in PARENT there must exist one record with REFID value = PARENT value. The value of REFID must be unique in the RELREF dataset. 
5. The value for LEVEL must be 1 for a record without a PARENT record.  This record may or may not have a child record.
6. If a record has a PARENT, LEVEL must be populated with a LEVEL that is sequentially one greater than the PARENT record (e.g., value for LEVEL = value for PARENT LEVEL + 1).

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