Researchers at the Joint Genome Institute produced nearly 10,000 new annotations of fungal mitochondrial genomes — the DNA found inside mitochondria, the energy-producing structures within cells. This is the largest dataset of its kind ever assembled. The team identified 15 core genes shared across all fungi, and found that some of these genes have moved from the mitochondria into the nuclear genome over evolutionary time. They also discovered more than 6,000 mitochondrial sequences previously unrecognized within existing public databases and recovered more than 3,000 others from environmental datasets. All of the annotations and data are publicly available through MycoCosm, the JGI’s web portal for fungal genome data. Learn more on the JGI’s website.