Zebrafish Larvae (IMAGE) Carnegie Institution for Science Caption Zebrafish larvae with a lethal mutation affecting fat metabolism (ffr) look the same as normal larvaes (wt) under normal magnification (left). However, when the embryos ingest lipid molecules labeled with a fluorescent tag (right), differences in fat metabolism become apparent. The normal embryos absorb the labeled lipids into their bloodstream, resulting in a fluorescent gut, while the mutants eliminate them, resulting in a darker gut. Credit Image courtesy Cell Metabolism Usage Restrictions Contact Cell Metabolism 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.