The insertion of Velocigene cassette ZEN-Ub1 created a deletion of size 3091bp between positions 10245786-10248876 of Chromosome 3 (Build GRCm39). Exons 1-4 were replaced by a lacZ sequence (in frame after the original ATG) and a loxP-neo-loxP cassette. (J:136110, J:211344)