Term Name:	geranylgeranyl-diphosphate geranylgeranyltransferase activity
Synonyms:	geranylgeranyl-diphosphate:geranylgeranyl-diphosphate geranylgeranyltransferase activity, phytoene synthetase activity, prephytoene-diphosphate synthase activity, PSase activity
Definition:	Catalysis of the reaction: 2 geranylgeranyl diphosphate = diphosphate + prephytoene diphosphate.
Ontology:	GO: Molecular Function [GO:0016767]    QuickGO    AmiGO