  Cells forming various epithelial tissues have a strikingly universal
distribution for the number of their edges. It is generally assumed that this
topological feature is predefined by the statistics of individual cell
divisions in growing tissue but existing theoretical models are unable to
predict the observed distribution. Here we show experimentally, as well as in
simulations, that the probability of cellular division increases exponentially
with the number of edges of the dividing cell and show analytically that this
is responsible for the observed shape of cell-edge distribution.
