Figure 2. Radiographs of ENU mutants exhibiting craniofacial abnormalities. (A) Stubby, an ENU mutant exhibiting Angle’s class III malocclusion, and incisors come into contact at the edge-to-edge position. (B) Mastodon displays underbite, resulting in the continuous growth of both maxillary and mandibular incisors with no compensatory occlusal wear. The long mandibular incisors protrude, and the long maxillary incisors curl back to form complete circles.