The two coding exons and intervening intron were deleted and replaced with a tau-GFP reporter and a loxP flanked pgk-neo cassette, and a subsequent cross to a Tg(EIIa-cre)Lmgd bearing strain excised the neomycin selection casssette yielding a GFP reporter that gives activity-dependent fluorescent marking of olfactory sensory neurons (J:215302)