The insertion of Velocigene cassette ZEN-Ub1 created a deletion of size 15756bp between positions 48404621-48420376 of Chromosome 6 (Build GRCm39). The ZEN-Ub1 cassette contains a lacZ reporter gene cassette and loxP site flanked neomycin resistance gene cassette. The neomycin resistance gene was removed via cre-mediated recombination. (J:302865)