A Velocigene cassette ZEN-Ub1 replaced a genomic region of size 16081bp between positions 134072572-134088652 of Chromosome 7 (Genome Build37). The hUBCpro-neo-p(A) cassette was removed via cre-mediated recombination. Western blot analysis confirmed complete loss of protein expression in various brain regions (hippocampus, cortex, cerebellum and midbrain) from homozygous mutant mice and a ~50% reduction in heterozygotes. (J:250125)