Centromere Swap (IMAGE) Duke University Caption A new paper from Duke molecular genetics and microbiology shows how pathogenic Cryptococcus fungi evolved from having many sexes to just two through 50 million years of gene swapping. Credit Kara Manke Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.