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Dox-induction of a 3-month-old double transgenic mouse for different time periods. (A–D) Images showing GFP expression in double transgenic mice induced for 1 day (A), 2 days (B), 5 days (C), and 7 days (D). After 1-day Dox induction, a weak GFP signal was detected in the cornea, which increased in intensity during a 7-day induction period.
