perturbMatch reference perturbation expression signatures

Reference gene expression signatures from single-gene perturbation (knockdown, knockout, overexpression) RNA-seq experiments in GEO, used by the perturbMatch R package to rank the perturbations whose expression response most resembles a query signature. These files are the hosted back end of the Bioconductor ExperimentHub package perturbMatchData and are not intended for direct download. Use perturbMatchData::perturbMatch_chrdir() or perturbMatch::getReferenceDatabase(), which fetch and cache them for you. See README.md for the file format and a standalone rebuild snippet. Four datasets over the same 39,376 NCBI genes: chrdir (6,802 signatures), chrdir_sva (5,786), limma (6,802) and limma_sva (5,786).