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I'll present a detailed comparison of millimeter observations of the massive NGC2264-C protocluster with hydrodynamical simulations of a collapsing cloud. I'll show how dynamical interactions of protostellar clouds associated with the large scale collapse of the parent cloud can help to form the required initial conditions for massive star formation in the central dense core of the collapsing protocluster. The initial conditions of the collapse of the parent cloud being crucial for the subsequent star formation history of the cluster, I'll present the first results of a statistical study on infrared dark clouds, believed to be the progenitors of proto-clusters.
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