Jet impingement assemblies and power electronics devices incorporating jet impingement assemblies are described. The retardation film has an axis distortion angle between a fast axis of the retardation film and an absorption axis of the polarizer of about +0. The instrumented user script code can be executed in a runtime environment, for example, by a just-in-time compilation service. The bonding wire is covered completely by the reflective potting compound or completely by the reflective potting compound together with the covering body. In particular, the present invention provides transgenic animals expressing a transdominant negative Rex gene product that inhibits retroviral replication.