Dynamics of a stationary tissue. (A) The time course for cell positions (front (red) , center (black) , and back (blue) for ) are shown. The time courses exhibit a front-back symmetry and two distinct frequencies, corresponding to the individual cellular contraction and extension and an emergent frequency from cell-cell mechanical coupling. (B) The time course for each cell-cell junction also exhibits multiple frequencies and periods of both tension and compression. Parameters are tension-feedback β = 0.16 and front-back polarity, δ = 0. To see this figure in color, go online.