Figure 2 (IMAGE) Tohoku University Caption In KL signaling (A), KAI2 functions as a receptor of an unknown plant hormone called KL. After binding with KL, KAI2 forms a complex with MAX2, an F-box protein, and SMXL, a repressor protein. SMXL is degraded by MAX2, leading to the de-repression of genes that were suppressed by SMXL, resulting in various responses. In KAI2 and MAX2 loss-of-function mutants (B), KL signaling does not occur, and gemma cups are not formed. In SMXL loss-of-function mutants (C), genes suppressed by SMXL are no longer repressed, mimicking KL signaling, and more gemmae are formed. Credit Komatsu et al. Usage Restrictions Reporters may use freely these materials in news coverage with appropriate credit information. 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.