Turning Off Genes (IMAGE) University of Pennsylvania Caption Researchers have identified small DNA 'signposts' that direct the silencing of genetic activity, allowing plants to move through different stages of development. Compared to normal Arabidopsis plants, plants with mutations in the Polycomb complex (two plants on right) have leaves that curl upward and flower early. The same is true for mutants in the 2 transcription factor families (TFs) that recruit Polycomb. 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.