  We study the interaction between two charge regulating spherical macroions
with dielectric interior and dissociable surface groups immersed in a
monovalent electrolyte solution. The charge dissociation is modelled via the
Frumkin-Fowler-Guggenheim isotherm, which allows for multiple adsorption
equilibrium states. The interactions are derived from the solutions of the
mean-field Poisson-Boltzmann type theory with charge regulation boundary
conditions. For a range of conditions we find symmetry breaking transitions
from symmetric to asymmetric charge distribution exhibiting annealed charge
patchiness, which results in like-charge attraction even in a univalent
electrolyte -- thus fundamentally modifying the nature of electrostatic
interactions in charge-stabilized colloidal suspensions.
