Subclones of green (green fluorescent protein, GFP+) Trp53−/−, red (tdTomato+) Trp53+/+ and yellow (GFP+/tdTomato+) Trp53+/− cells can be traced in preinvasive Kras mutant lung adenomas initiated by inhaled lentiviral Cre infection30. This evidence concerns the gene KRAS and lung adenoma.