R. Craig Albertson, UMass Amherst (IMAGE) University of Massachusetts Amherst Caption UMass Amherst biologist Craig Albertson works with a system - cichlid fishes - known as champions of phenotypic plasticity that can alter, in a single season, jawbone hardness or shape to match feeding conditions. In a new paper, he and colleagues identify the well-studied chemical/molecular system known as the Hedgehog (Hh) signaling pathway as an important player in the process. Credit UMass Amherst 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.