KRas expression inhibits tumor formation in after Cre-mediated expression of Braf^V600E in <i>Braf^CA</i>^/+ mice.

<p>Sections of lungs from <i>Braf^CA/+</i> mice infected with LEX-iCL lentiviruses expressing EGFP, KRAS^V12 or the indicated KRAS^V12/ED mutants. Slides were stained with haematoxylin and eosin and are shown at low (upper panels) and high (lower panels) magnification. The box in the upper panels depicts region shown at higher power. All images are representative for each lentiviral construct. Bars, 3 mm.