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Quantifying dorsal closure in three dimensions

The three-dimensional surface of dorsal-closure-staged Drosophila embryos is indented by two purse strings that surround an eye-shaped amnioserosa tissue. The amnioserosa forms a remarkably smooth, asymmetric dome that bulges outward due to the embryo’s internal pressure. Quantitative analysis with Laplace’s formula indicates that the elastic properties of the amnioserosa are isotropic and uniform.