Zebrafish Heart Development (IMAGE) eLife Caption This is asymmetrical cardiac expression of the meis2b gene (shown here in cyan) at early stages of embryonic heart development in zebrafish. Credit Almary Guerra Usage Restrictions This image is free to be reused, as long as it is credited as appropriate. 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.