Ceratopteris gametophyte (IMAGE) Purdue University Caption A hermaphroditic gametophyte of Ceratopteris, which produces sperm and eggs, forming a meristem notch. Green: nuclei labeled with a green fluorescent protein (GFP) for tracking cellular behavior; magenta: cell wall. Credit Purdue University/Yuan Geng and Yun Zhou Usage Restrictions News organizations may use this image in reports about the work of Purdue University’s Yun Zhou and his collaborators. License Original 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.