  The main purpose of this work is the modelling of large single populations of
cells under different interactions among themselves, in balance with natural
random diffusion. We focus on cell-cell adhesion mechanisms for one single
population confined in isolated domains. Our most relevant contribution is the
proposal of a mathematical model, that includes a nonlocal saturation
coefficient multiplying an appropriate nonlocal drift term, that can even
induce repulsion effects from saturated areas.
