Clusters and fluctuations at mean-field critical points and spinodals

We show that the structure of the fluctuations close to spinodals and mean- field critical points is qualitatively different from the structure close t o non-mean-field critical points. This difference has important implication s for many areas including the formation of glasses in supercooled liquids. In particular, the divergence of the measured static structure function in near-mean-field systems close to the glass transition is suppressed relati ve to the mean-field prediction in systems for which a spatial symmetry is broken.