Find all genomic features that overlap a specific gene or transcript. Given an Ensembl ID, returns features like genes, transcripts, exons, CDS, variations, and regulatory elements that physically overlap this feature's coordinates. This answers questions like 'What variants are in this gene?' or 'What other genes are nearby?' without needing to know the exact coordinates.
Original spec description
Retrieves features (e.g., genes, transcripts, variants) that overlap a region defined by the given identifier.