Knock-in Frog Embryo (IMAGE) Hiroshima University Caption This image shows fluorescence visualization of a gill in a frog embryo using the PITCh knock-in system. The arrow indicates the gill (green). Credit Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University Usage Restrictions This image may be freely used, with copyright noted, in news of research of Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University. 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.