  We consider a minimal computational model of tissue dynamics with two active
ingredients: local particle division and apoptosis. We neglect other
non-equilibrium effects such as self-propulsion. We simulated the steady state
dynamics inside an asymmetric channel and we found a net macroscopic current
along the channel. Although such macroscopic current in a similar geometry has
been detected in swimming bacteria, our results showed that local division and
apoptosis are sufficient to generate a macroscopic current, without any need
for a self-propulsion/swimming mechanism. Our results might have applications
in tissue engineering such as controlling tissue growth via a geometrically
non-uniform substrate.
