Zebrafish Larva (IMAGE) Instituto de Medicina Molecular Caption This is a 5-day-old zebrafish larva, in which motor neurons are marked with a green fluorescent protein. Credit Diana Chapela, iMM Usage Restrictions Use credits. 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.