shg in which all four serine residues are mutated to phosphomimetic aspartic acid and tagged at the C-terminal end with GFP has been knocked in to a founder shg knockout line containing an attP site.
As a result of whole-cell FRAP assay, shgS4D.GFP homozygous embryos exhibit significantly reduced DE-Cad biosynthetic turnover in both polarizing cells (stage 9-11 embryos).