Overexpression of an epitope tagged Notch1 in the inner root sheath of hair follicles driven by the ivolucrin (Ivl) promoter (species not specified). Beta-galactosidase expression was driven concurrently by the involucrin promoter using an internal ribosomal entry site (IRES). (NOTE: This abstract does not indicate which species of Notch1 or involucrin is being used) (J:65042)