TM^Pro expression is a determinant of the sustained adhesion and/or early survival of tumor cells newly localized to the lung. Quantitative analyses of residual radiolabel within the lungs of WT (solid bars) and TM^Pro mice (open bars) after IV injection of ¹²⁵I-labeled LLC^GFP cells. Cohorts harvested at each time point consisted of 5-6 mice of each genotype. Data represents mean and SEM (*P < .05, **P < .005).