Biochemical reaction graphics from the Rhea database have been added to relevant Gene Reports. They are shown within the “Function” → “Catalytic Activity” section, which has been reorganised to present an integrated view of Enzyme Commission (EC) and Rhea data, e.g. Pfk. These data are derived from our Gene Ontology (GO) Molecular Function annotations, based on the EC/Rhea cross-references within the GO itself. Links to the source databases are also provided where additional information about the reaction and participants may be obtained.