The transgene was designed with a 1.4 kb mouse Math1 (Atoh1) 3' enhancer (and a beta-globin minimal promoter) sequence upstream of a CreERT2 fusion gene (Cre recombinase fused to a G400V/M543A/L544A triple mutation of the human estrogen receptor ligand binding domain). Tamoxifen-inducible cre activity is observed in neural progenitors of the cerebellar rhombic lip, dorsal hindbrain and spinal cord, as well as in inner-ear primordia (with a limited amount of ectopic expression in the primordium of the hippocampus but not the cortex).
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