Co-elution of members of protein complexes in SEC. For each experiment, the distribution of pairwise correlations between members of the same protein complex was analysed (green). As expected, members of protein complexes tend to co-elute in all SEC experiments, as indicated by positive correlation values. A set of randomly defined protein complexes was used as control (gray). For all the experiments, the correlations of real complexes are significantly higher than random ones, p < 2.2e-16 Wilcoxon Rank Sum test. 