Complex III sub-graph 3 and its sub-graphs. Images are taken from Cytoscape. Cluster 3 comes from the partition of the whole PPI network of complex III with ClusterONE. Cluster 3.1 comes from the partition of cluster 3 with ClusterONE. Cluster 3.1.1 and 3.2.2 come from the partition of cluster 3.1 with MCODE. Complex III proteins are represented by grey circles; complex IV proteins by grey rounded squares; complex IV assembly factors by grey octagons; Usb1p by a white lozenge and other proteins by white circles.