Signaling Molecule (IMAGE) Osaka University Caption The signaling molecule CLE9/10 (a small peptide hormone, shown in red) regulates two different developmental processes, depending on which large protein receptor interacts with the peptide. When it interacts with HSL1 receptor (pale blue) in the leaf, it regulates how many leaf pores (stomata) develop. When it binds to BAM receptor (dark blue) in the root, it regulates the development of the cells that form the water-conducting vessels (xylem). The interactions of CLE9/10 probably also involve co-receptor proteins, SERK (green) acting along with HSL1 and another protein (yet to be identified, shown in gray) along with BAM. Credit Osaka University Usage Restrictions None 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.