(IMAGE) Hong Kong University of Science and Technology Caption A diagram demonstrating how hedgehog molecules are secreted from the producing cells and received by the target cells to induce the signal transduction pathway in target cells. Credit HKUST Usage Restrictions N/A 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.