<p>DNAs from the lung tissues of SPC-Cre-ER<sup>T2</sup>/TSC1<sup>fx/fx</sup> transgenic mice treated with vehicle or tamoxifen were examined by PCR to detect <i>TSC1</i> deletion as an indication of Cre-ER<sup>T2</sup> recombinase activity. M, DNA marker; +, a transgenic mouse with <i>TSC1</i> deletion; -, C57BL/6J mouse. Other lanes, offspring from F42 and F67 founders treated with vehicle (vehi) or tamoxifen (tam).</p