Please cite - ConTra is described in:
Ćukasz Kreft, Arne Soete, Paco Hulpiau, Alexander Botzki, Yvan Saeys, Pieter De Bleser
ConTra v3: a tool to identify transcription factor binding sites across species, update 2017
Nucleic Acids Res 2017 gkx376. doi: 10.1093/nar/gkx376