“…Thus, polyphenols, triterpenoids, and polysaccharides in the birch were considered as simulators for the steroid biosynthesis of I. obliquus. Fungi digest food outside their bodies by releasing enzymes into the surrounding environment, breaking down organic matter into a form the fungus can then absorb (17,20,24,25). These compounds such as saccharides, terpenoids, and phenols not only involved in sterol biosynthesis directly, but also glucose derived from polysaccharides metabolism was beneficial for sterol biosynthesis.…”