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Time evolution of the normalized tissue area through the three phases. (Insets) Tissue shape and area contraction rate distribution (in grayscale) at t = 105.2 and 191.8 min. Internal and AC ratchets are both activated at the onset of DC (t = 0). After the start of the fast phase (t = 80 min), the resting length of the cellular segments and the AC cable are reduced at regular periods.
