: You will most often encounter this ID in bioinformatics pipelines, particularly those involving L1000 gene expression profiling . It identifies a specific treatment applied to cell lines to observe transcriptional changes.
: The measured response of a cell to this specific molecule. 435380_491151
If you are working with a specific dataset (like a CSV or a GCT file from a repository like GEO or CLUE.io), this feature represents a linked to: Metadata : The chemical name, SMILES string, or InChIKey. : You will most often encounter this ID