(IMAGE) National Institutes of Natural Sciences Caption Female medaka lacking foxl3 genes shows standard female body shape. In the ovaries of foxl3 mutant female medaka, a large number of sperm and a small number of eggs are formed. Credit National Institute for Basic Biology 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.