CORUM: the comprehensive resource of mammalian protein complexes. - Andreas Ruepp; Barbara Brauner; Irmtraud Dunger-Kaltenbach; Goar Frishman; Corinna Montrone; Michael Stransky; Brigitte Waegele; Thorsten Schmidt; Octave Noubibou Doudieu; Volker Stümpflen; Hans-Werner Mewes (Nucleic Acids Res., 2008)