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We prove that if the universal minimal flow of a Polish group   $G$   is metrizable and contains a   $G_\delta $   orbit   $G \cdot x_0$  , then it is isomorphic to the completion of the homogeneous space   $G/G_{x_0}$   and show how this result translates naturally in terms of structural Ramsey theory. We also investigate universal minimal proximal flows and describe concrete representations of them in a number of examples.

Polish Groups with Metrizable Universal Minimal Flows