Classification of interacting proteins according to Biological Processes. Manual curation of the annotations for each interacting protein when available were retrieved from Wormbase WS190  and used to define the 11 groups of processes shown. PDZ domain proteins appear to be involved in a disparate range of functions.
Lenfant et al. BMC Genomics 2010 11:671 doi:10.1186/1471-2164-11-671