skeleton
• 9 of 15 (60%) of mutants exhibit skeletal abnormalities
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• 1 of 15 (7%) mutants show sternum malformations
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• 8 of 15 (53%) mutants show fusion of C1-AA with C2 dens
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• 2 of 15 (13%) mutants show a bifid C2
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• 1 of 15 (7%) mutants show posterior transformation of C7 to T1
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