Stanley Milgram’s groundbreaking „Six Degrees of Separation“ experiment demonstrated the surprisingly close connections between us humans back in the 1960s. Now the research team led by Professor Matthias Mann at the Max Planck Institute (MPI) of Biochemistry has shown that the proteins in our cells are equally well connected. The results of the current study, which are published in the journal Nature, are a decisive step forward in protein research and represent the first comprehensive view of the protein-protein interaction network of an organism.