Figure (IMAGE) University of Tsukuba Caption Control adult (left) and Pks1 homozygous knock-out (right). Both are F2 generation. Credit University of Tsukuba Usage Restrictions Unauthorized use is prohibited 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.