skeleton
• the clavicles are attached to the rib cage by connective tissue and do not articulate directly with it unlike in wild-type mice
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• a eighth rib is attached to the sternum unlike in wild-type mice
• T1 ribs exhibit incomplete projection and T2 ribs extend but often do not reach the sternum (in 64% of mice)
• however, rib attachment posterior to T1 is normal
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• ribs initiate but do not extend on T1 unlike in wild-type mice
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• mice are missing a complete first rib
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rib fusion
(
J:124112
)
• rib 2 and 3 are fused prior to attachment to the sternum
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• dorsal cartilage is thickened and forms a distinct curvature at the top of the vertebra unlike in wild-type mice
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• C3 through T2 exhibit anterior homeotic transformations
• C3 through T1 exhibit characteristics of C2
• however, posterior thoracic, lumbar, and sacral vertebrae are normal in appearance and position
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• C3 through T1 exhibit characteristics of C2
• T2 lacks anterior projections and is similar to T3
• ibs do not extend on T1 unlike in wild-type mice
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• C3 through T1 exhibit characteristics of C2
• vertebral foramina extend beyond C6 to C7 unlike in wild-type mice
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