The document describes a computational model of early mouse ovarian development using a cellular Potts model. The model simulates the migration of primordial germ cells into the gonadal ridge and their proliferation into germ cell nests and follicles. Key parameters like cell adhesion, growth, apoptosis and signaling molecule concentrations are modeled based on literature. The model is tuned by comparing simulations to experimental data. The goals are to understand normal development, identify biological perturbations, and provide a framework for toxicity testing alternatives.