Secondary Source Identifier [si]
The [si] qualifier identifies a secondary source that supplies information, e.g., other data sources, databanks and accession numbers of molecular sequences (e.g., GenBank; ClinicalTrials.gov – beginning in July 2005).
- Use [si] to qualify the Secondary Source Identifier. The field is composed of a source followed by a slash followed by an accession number.
genbank/af113832 [si] clinicaltrials.gov/