A) AGMlacZ/+ organs were stained for β-gal activity (blue). AGM is largely restricted to the vasculature and predominates in SMC-invested large vessels in small intestine, lung, pancreas, bone marrow, and skin, with little staining in liver. B) Tissues from C57BL/6 mice were immunostained for AGM (red/brown). AGM is weakly expressed in vascular rich tissues. Micron bar = 50 μm.