1.14.14.171 Combinatorial biosynthesis of sapogenins and saponins in Saccharomyces cerevisiae using a C-16alpha hydroxylase from Bupleurum falcatum Bupleurum falcatum 1.14.14.171 Unraveling the triterpenoid saponin biosynthesis of the African shrub Maesa lanceolata Maesa lanceolata