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I will discuss transition protoplanetary disks observed by ALMA which have a large inner dust cavity. They are believed to be in the process of planet formation although other central clearing mechanisms are possible. Several of these disks show asymmetric emission that has been associated with vortices where the dust can be trapped and grow to form planetesimals. I will discuss the analysis of the dust properties in the asymmetric transition disks HD142527 and work needed to further elucidate the properties of this dust trap.