A and B, nLacZ staining in the aortic arch (A) and descending aorta (B) showing TRPV1 expression is restricted to small feeding arteries ‘vasa vasorum’ (see inset). C–L, abdominal aorta (C), common carotid (D) and external (ECA) and internal carotid (ICA) arteries (E), facial artery (F), maxillary artery (G), superficial temporal artery (H) and mesenteric arteries (I–L) (note restricted expression to small diameter branches). Data were compiled from 10 mice.