This connects you to NCBI's Gene Expression Omnibus, the public repository with 264,000+ genomics studies and 8 million samples. You get programmatic access through GEOparse and E-utilities to search for microarray and RNA-seq datasets, pull down expression matrices, and grab supplementary files. The hierarchical structure (GSE series, GSM samples, GPL platforms) takes a minute to internalize, but once you do, it's straightforward to filter by organism or condition, extract gene-specific profiles, or build comparative analyses. Handles both the curated GDS collections and raw experimental data. If you're doing transcriptomics work and need existing datasets for validation or meta-analysis, this saves you from manual downloads.
npx skills add https://github.com/davila7/claude-code-templates --skill geo-database