There are three mammalian hyaluronan synthases described to date - HAS1, HAS2 and HAS3.
ATP synthase | NO synthase | ATP synthase subunit C | Salutaridine synthase | Ribbon diagram of Sucrose Synthase-1 3S27 Structure, isolated from ''Arabidopsis thaliana | Porphobilinogen synthase | Phosphoribosylaminoimidazolesuccinocarboxamide synthase | Hyaluronan |