To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. The beating heart of a wild-type Xenopus laevis embryo. Wild-type embryos show a dynamic beating of the heart and blood flow through the ventricle and outflow tract. A representative embryo is shown from the ventral side. Fbrsl1 is required for heart development in Xenopus laevis and de novo variants in FBRSL1 can cause human heart defects Hanna Berger, Sarah Gerstner, Marc-Frederik Horstmann, Silke Pauli, and Annette Borchers Disease Models and Mechanisms 2024. 17:None-None; doi: 10.1242/dmm.050507 Download Original Video