LAUSR

The cadherin‐associated protein p120 catenin regulates convergent extension through interactions with cadherin proteins, Cdc42, and Rac1, as we previously showed in zebrafish (Danio rerio). Phosphorylation of p120 catenin changes the nature of its activity in vitro but is virtually unexplored in embryos. We used our previously developed antisense RNA splice‐site morpholino targeted to endogenous p120 catenin‐δ1 to cause defects in axis elongation probing the functions of three p120 catenin tyrosine‐phosphorylation sites in gastrulating zebrafish embryos.