Wild-type and Genderswapped Volvox (image) PLOS Caption Wild-type and genderswapped Volvox. Color differential interference contrast images of V. carteri wild-type male (upper left), wild-type female (upper right), pseudo-female (lower left) and pseudo-male (lower right). Credit Sa Geng and James Umen. doi:10.1371/journal.pbio.1001905.g001 Usage Restrictions 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.