To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 4 Apical hook development from embryos of pin2 mutant orientated in root- upwards position. Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis Qiang Zhu, Marçal Gallemí, Jiří Pospíšil, Petra Žádníková, Miroslav Strnad, and Eva Benková Development 2019. 146:None-None; doi: 10.1242/dev.175919 Download Original Video