text: * [http://www.thebiogrid.org/ BioGRID] database
  * [http://mentha.uniroma2.it mentha] the interactome browser 
  * [http://www.ebi.ac.uk/intact IntAct: The Molecular Interaction Database]
  * [http://interactome.org Interactome.org] — a dedicated interactome web site.