skeleton
• sternebrae 4 and 5 are fused
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• mice exhibit a misalignment of the first rib to the sternum
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• C7 exhibits protrusion of ectopic bony material from the transverse process unlike in wild-type mice
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• 7 of 9 mice have a seventh lumbar vertebrae
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• 7 of 9 mice exhibit S1 to L7 transformation
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