Status	Description	Organism	Genes	References
	15-cis-phytoene synthase	Myxococcus xanthus	crtB
	15-cis-phytoene synthase	Rhodobacter capsulatus	crtB
	15-cis-phytoene synthase	Synechococcus elongatus	crtB
	Phytoene synthase	Mucor circinelloides	carRP	[5] [61]