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Since embryos change their morphology drastically in the gastrulation stage, mechanical characterization of young embryos is important as they also change their tissue stiffness with the stage of development. Herein, virtual compression tests were conducted assuming that the  Xenopus laevis  gastrula has a spherical shape with transverse anisotropy. Based on the design of experiments, we found that the Young’s moduli and material anisotropy can be efficiently determined by measuring the reaction force and surface displacement when indenting the tester into an embryo. The proposed scheme may be a substantial step toward understanding the timing of cell-type specification during embryo development.

Stiffness estimation of transversely anisotropic materials using a novel indentation tester with a rectangular hole