An FRT-flanked neomycin selection cassette replaced the 3' part of the transcript and loxP sites flanking the whole gene were inserted to allow a full deletion on top of the partial deletion. Flp-mediated recombination removed the selection cassette. Cre-mediated recombination removed the floxed region which results in a fully deleted region (the RNA, the CpG island, and part of the upstream region). (J:304782)