Micro-injection of Zebrafish Embryos (IMAGE) McMaster University Caption (a) Zebrafish embryo immobilized by suction capillary. (b) Needle inserted into yolk sack. (c) Electroosmotic pumping of methylene blue solution into the embryo by the application of 25 V for 10 s. (d) Needle retracted from the embryo. Credit McMaster Engineering Usage Restrictions Email genen@mcmaster.ca for permission to publish 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.