enzyme is involved in paclitaxel biosynthesis. Supplying Nicotiana benthiamana expressing taxane-2alpha-O-benzoyltransferase, 10-deacetyl baccatin III-10-O-acetyltransferase, T9alpha oxidase, and taxadiene-5a-ol-O-acetyl transferase with deacetyl-9-dihydro-13-acetylbaccatin III as an exogenous substrate results in the production of baccatin III