newly developed software (VIDEO) University of Münster This video is under embargo. Please login to access this video. Caption Using newly developed software, researchers digitally merged microscopic images of hundreds of zebrafish embryos. This enabled them to identify patterns in how primordial germ cells behave in the absence of the attractant receptor Cxr4b. They found that tissue along the longitudinal axis of the embryos acts as a physical barrier, influencing the direction of cell movement and hindering the cells from migrating through the tissue. Credit Gross-Thebing, Truszkowski, Tenbrinck et al. Sci Adv 2020;6: eabc5546/CC BY-NC Usage Restrictions The use of any images that may be sent with this press release is permitted exclusively in the above-mentioned context and with reference to the source. 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.