Scientists discovered how a medicinal mushroom called Ganoderma lucidum breaks down cellulose from plant waste. The study found that a protein called GlSlt2 activates another protein called GlMyb, which then turns on genes that produce cellulase enzymes. These enzymes break down cellulose into sugar that the fungus can use for growth. This discovery could help improve the conversion of agricultural waste into biofuels and other useful products.