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Volumetric growth of a bilayer tissue in a spherical antrum: (a) initial configuration before growth and (b) current configuration after growth.
Dependence of the critical growth factor and the critical mode number on the modulus ratio . The inset shows, for example, the surface wrinkling of a mucosa with .
Influences of the mucosal and submucosal thicknesses on the critical mode number .
Diagrams of the critical wrinkling patterns: (a) axisymmetric pattern and (b) a possible symmetric breaking of mucosal surface.
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