Fig. 1

Part of the synapse domain of the GO cellular component ontology. The QuickGO (http://www.ebi.ac.uk/QuickGO) view of the parent–child relationships between the GO terms ‘postsynaptic membrane’ and ‘cellular component’. The black arrows are used where a term has an ‘is_a’ relationship to its parent term, the blue arrows indicate a ‘part_of’ relationship, www.geneontology.org/GO.ontology.relations.shtml