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Initial perturbation and convolution of the model. (a) Different initial perturbations are applied on the free surface of cortex; (b) Instability initiation; (c) Folding after instability; (d) Convolution of the model. The cortex and fibers are growing simultaneously and create a convoluted pattern on the free surface of the cortex. Growth rate of fibers is the same as the cortex growth rate. The dark gray area in the middle is located on a hinge.
