The Wnt1 promoter preceded the cre recombinase coding sequence which was followed downstream by the Wnt1 enhancer. The Wnt1 regulatory sequences initially direct expression in the midbrain. After neural tube closure, expression occurs in the dorsal and ventral midlines of the midbrain and caudal diencephalon, the midbrain-hindbrain junction and in the dorsal spinal cord. Line 11 inserted into the gene at 6425500-6456783 (Build GRCm38/mm10) resulting in a 31,283 bp deletion. Founder line x has a copy number of greater than 5.