The following elements were inserted in order into 2 kb upstream of the Ubb locus by targeted recombination: CMV enhancer/beta-actin promoter (CAG), loxP site, beta-geo, 3 stop transcription sites, loxP site, tdTomato/Tobacco etch virus protease (TEVP), a 6xmyc epitope, a TEVP cleavage site, post-synaptic density protein (PSD95), GFP, 3xHA epitope, rabbit beta-globin 3' UTR. (J:157150)