TRANSFAC contains published data on eukaryotic transcription factors and miRNAs, their experimentally-proven binding sites, and regulated genes. It allows users to identify gene regulators, visualize promoter and regulatory features, identify binding sites, upload users' own sequence and identify the predicted binding sites, upload and compare users' own custom matrix against TRANSFAC's matrix library, analyze ChIP-seq data sets, and analyze transcript-based RNA-seq data sets.