| Type | MGI:General | Description | homozygotes posture for an occipital rather than a forepaw landing when hung by the tail however, at rest, the S-shaped, sagittal posture of the vertebral column is identical for wild-type and mutant mice: both hold the head with the atlanto-occipital joint fully flexed, the cervico-thoracic junction fully flexed, and the cervical column upright |