Difference in tilt angulation of the zygomatic arch. The photographic image showed a lateral view of dry skulls respectively collected from a Cebpb+/+ and a Cebpb-/- 12-month-old mice. A downward tilt of the zygomatic arch in the Cebpb-/- mouse was confirmed by the morphology of the dry skull (yellow arrow). Scale bar: 1 mm. (n = 23, including 5 Cebpb-/-, 10 Cebpb+/- and 8 Cebpb+/+ female mice).