  The effect of asymmetry in the transbilayer lipid distribution on the
dynamics of phase separation in fluid vesicles is investigated numerically for
the first time. This asymmetry is shown to set a spontaneous curvature for the
domains that alter the morphology and dynamics considerably. For moderate
tension, the domains are capped and the spontaneous curvature leads to
anomalously slow dynamics, as compared to the case of symmetric bilayers. In
contrast, in the limiting cases of high and low tensions, the dynamics proceeds
towards full phase separation.
