To eliminate the neo cassette from the intronic region of Gria2, GluA2mice were crossedwith a Cre deleter line that expressed Cre recombinase in all tissues including the germline. This cross produced offspring carrying a single mutated allele with out the neo cassette. Remarkably, removing the neo cassette Nilotinib uncovered a dramatic phenotype
in heterozygote animals, suggesting that the presence of the neo cassette had brought on unequal expression of themutant allele,
