Plant Hormone Receptor (IMAGE) Max-Planck-Gesellschaft Caption Left: This is the LLR domain of the receptor BRI1 (blue). In a first step, BRI1 binds the steroid hormone (yellow) to a surface pocket. This creates a docking platform for the smaller and shape-complementary LRR-domain of SERK1 (orange), which binds on top, with the steroid acting as a molecular glue. Credit Julia Santiago. 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.