Data sources:

• CIS-BP Database: Catalog of Inferred Sequence Binding Preferences
• CISBP-RNA Database: Catalog of Inferred Sequence Binding Preferences of RNA binding proteins
• TRANSFAC motif database
• JASPAR motif database
• HocoMoco motif database
• Uniprobe PBM database
• Vaquerizas et al TF census
• TFCat
• TFClass
• Protein Data Bank (PDB)
• Pfam
• SMART
• Interpro
• Gene Ontology