To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 In utero ultrasound of Rdh10flox/flox mutant embryos reveals backwards head extension only without mouth movement. RDH10 function is necessary for spontaneous fetal mouth movement that facilitates palate shelf elevation Regina M. Friedl, Swetha Raja, Melissa A. Metzler, Niti D. Patel, Kenneth R. Brittian, Steven P. Jones, and Lisa L. Sandell Disease Models and Mechanisms 2019. 12:None-None; doi: 10.1242/dmm.039073 Download Original Video