Heart lNRA (IMAGE) Max-Planck-Gesellschaft Caption This image (right) shows defective cardiac function (Fendrr mutations) in mouse embryos at 12.5 days, in comparison to normal embryos (left). (la -- left atrium, lv -- left ventricle, ra -- right atrium, rv -- right ventricle) Credit MPI for Molecular Genetics 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.