mortality/aging
• fewer than expected mice are present at weaning
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reproductive system
skeleton
• in some mice with the T12 phenotype
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• mice exhibit a T13/L5 (jn most mice) or T12/L6 (in some mice) configuration compared with T13/L6 (in most) or T13/L5 (in few) wild-type mice
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• T10, T11 and T12 in some mice exhibit high incidence of fissures affecting the dorsal surface
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• T13 to a lumbar vertebrae
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• missing sixth lumbar vertebrae
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• in some E15 and adult mice
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• fusion of all sacral vertebrae
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• reduced migration
• however, proliferation is normal
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