Scientists sequenced the complete genomes of two compatible strains of the king bolete mushroom (Phlebopus portentosus), an important edible and medicinal species. The study found that mobile DNA elements called transposons play a major role in creating genetic differences between the two fungal nuclei and in generating the diversity of compounds that give mushrooms their health benefits. The research shows this mushroom can both partner with trees and break down organic material on its own, making it uniquely adaptable.