The gene was disrupted by replacement of a genomic region encoding the Gli N-terminal and zinc finger domains with a floxed-neo cassette and a lacZ having a nuclear localizing signal. The floxed-neo cassette was subsequently removed by crossing mutant animals to a cre deleter strain. The lacZ expression pattern in homozygous mutant embryos is identical to that of wild-type Gli as determined by immunohistochemical analysis. (J:79392)