Apoa2 regulates convergence of lateral cells. Labeled lateral mesendermal cells at shield stage in 8 ng ctl MO (A, C) or apoa2 MO1 (B, D) injected embryos were observed and imaged at the tail-bud stage (A′, B′, C′, D′, respectively). (A′–B′, C–D, and C′–D′) show lateral views and (A–B) show dorsal views. E, quantification of dorsal migration of lateral cells.