2.5.1.90	(2E,6E)-farnesyl diphosphate + 5 isopentenyl diphosphate = 5 diphosphate + all-trans-octaprenyl diphosphate	isopentenyl diphosphate condensation rather than product release is rate limiting	707542	
2.5.1.90	(2E,6E)-farnesyl diphosphate + 5 isopentenyl diphosphate = 5 diphosphate + all-trans-octaprenyl diphosphate	sequential mechanism	707356