Class I terpene cyclases are associated with the biosyntheses of meroterpenoids, in reactions that have to have the cyclization on the terpenoid moiety before the fusion which has a nonterpenoid moiety, and are somewhat rare as many of the fungal meroterpenoid pathways adopt course II cyclases. Terpenoids are derivatives http://kcupcbd.bloggosite.com/7557582/rare-terpenes-can-be-fun-for-anyone