The interplay of stiffness and force anisotropies drives embryo elongation.

In the HYP7 cell, actin filaments already acquired a preferential DV alignment at the 1.3F stage ( Figure 8c ), but became increasingly organized along the DV direction as the embryo elongated to the 2F stage, with a highly significant difference between the 1.5F and 1.7F stages ( Figure 8c and f ).

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