 (D) Quantification of basal myosin-II levels (N=3 embryos) in ectodermal and mesodermal cells. In the mesoderm, basal myosin-II levels decreasd 5-fold over the course of internalization, while in the ectoderm only ~3-fold. Additionally, myosin-II depletion appeared to be accelerated in the mesodermal cells as indicated by the steeper slope of the polynomial fit (3rd degree with r2Ectoderm: 0.98 and r2Mesoderm: 0.87). Note the logarithmic y-axis 