previous work in our laboratory has illustrated that excessive cell death in the proximal aspect of the maxillary and mandibular prominences of the first visceral arch and in the apical ectodermal ridge of the limb bud probably accounts for the characteristic craniofacial and limb abnormalities observed ( sulik et al , 1987 ; sulik and dehart , 1988 ) .
C1512982
mandibular prominences
C0231063
first visceral arch