Abstract
A model simulating the growth of clones of cells in two dimen sions is described. This model includes an algorithm that simulates the displacements which occur when interior cells divide in a cell mass; the model uses an algorithm which allows more realistic simulation than did previous models that did not possess this facil ity. Applications of the model are discussed, and details are given of the execution of the program on refresh display video, allow ing dynamic observation of the modelled cell division process.