Lower dosage of tamoxifen mediates sufficient recombination on adult <i>Myh6</i>^{<i>MerCreMer/+</i>} hearts.

<p>Administration of tamoxifen at 0.05 mg/g body weight for 3 days also introduces robust tdTomato expression in <i>Myh6</i>^{<i>MerCreMer/+</i>};<i>R26R</i>^{<i>tdTomato/+</i>} mouse hearts (A,B). No recombination occurs in the control hearts (<i>R26R</i>^{<i>tdTomato/+</i>}, C,D). Arrows in A,B indicate coronary vessels.