skeleton
• C7 transformation to T1 in all mice with ectopic ribs on C7
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• C1 to C2 in 2 of 7 mice
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• posterior transformation of the axis as in null mice
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• T1 to T2 in 5 of 7 mice
• T13 to L1 in all mice
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• C7 to T1 in all mice with ectopic ribs on C7
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• L6 to S1 in all mice
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