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Grouping of a non-redundant dataset of 278 heterodimer protein complexes into functional groups as described elsewhere [23]. These include obligatory (208), immune (18) and non-obligatory (52). The obligatory protein complexes are further classified into enzyme (40), regulator (144) and biological assembly (24) and the non-obligatory protein complexes into enzyme inhibitor (25) and regulator inhibitor (27).
