FIG. 6.

Morphology of individual vertebrae of Af9 mutant mice. Vertebrae from the cervical and thoracic regions of stained skeletons of newborn Af9LZ mice were dissected and examined under a microscope. Samples from a homozygous Af9 knockout animal (−/−) and the corresponding segments from a wild-type control mouse (+/+) are shown. All cervical vertebrae (C1 to C8) and the first thoracic vertebra (T1) are shown. The third vertebra of Af9 mutants exhibited C2 characteristics, while C4 to C8 resembled C3 to C7 in the wild type.