Large vs. Small Mucor Spores (IMAGE) Duke University Medical Center Caption Scanning electron microscopic images of giant spores (left) from a (-) mating type strain of the human pathogenic zygomycete Mucor circinelloides and smaller spores (right), from a (+) mating type strain. Images are in the same scale. Credit Deborah Springer, Joseph Heitman and Soo Chan Lee, Duke University Medical Center 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.