  We study the existence of segregated solutions to a class of
reaction-diffusion systems with strong interactions, arising in many physical
applications. These special solutions are obtained as weak limits of minimizers
of a family of perturbed functionals. We prove some a priori estimates through
a minimization procedure which is nonstandard in the parabolic theory: our
approach is purely variational and all the information is encoded in the family
of functionals we consider.
