Vegfr2-luc expression in different tissues. (A) Female Vegfr2-luc mice (n = 3) were killed at 8 weeks of age. Selected organs were excised, homogenized, and measured for luciferase activity. Data are presented as mean ± SE. (B) Northern blot analysis of VEGFR2 mRNA expression. Total RNA (4 μg per lane) from various organs of 8-week-old female Vegfr2-luc mice was extracted and analyzed. Lower panel displays an image of ethidium-bromide–stained gel to demonstrate even loading.