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GFP expression in freshly isolated and cultured mammalian taste papillae. GFP expression is not artifact but under the control of an olfactory receptor promoter (green). (A) and (C): No autofluorescence observed in either freshly isolated (A) or cultured (days 3–5; C) wild-type mouse taste cells. (B) and (D): Both freshly isolated (B) and cultured (D) taste cells from mOR-M71-GFP mice show GFP expression. Scale bars: B and D = 25 µm; C = 50 µm.
