An embryo of the sea squirt Ciona (IMAGE) PLOS Caption An embryo of the sea squirt Ciona. The nuclei of the 40 notochord cells are highlighted in red by a Brachyury antibody generated in the Di Gregorio lab. The contours of a few notochord cells are defined by green fluorescent protein. All other visible nuclei are colored in blue. Credit Image Credits: Janice H. Imai and Anna Di Gregorio 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.