Hormone 'Switch' Directs Floral Fate (IMAGE) University of Pennsylvania Caption Instead of flowers, plants with mutations in certain chromatin remodeling genes developed pin-like structures (right). Credit University of Pennsylvania Usage Restrictions In context of reporting 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.