To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 sox2 expression in a hoxa13;ntlcs mutant with a class 1 phenotype.The same embryo as in Figure S6D-F. Hox13 genes are required for mesoderm formation and axis elongation during early zebrafish development Zhi Ye, and David Kimelman Development 2020. 147:None-None; doi: 10.1242/dev.185298 Download Original Video