skeleton
• Background Sensitivity: on a mixed genetic background, heterozygotes display skeletal dysplasias with incomplete penetrance and variable expressivity; however, these skeletal abnormalities are significantly different from those observed on an coisogenic background
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• 3 of 35 heterozygotes show unilateral fusion of the 8th rib to the sternum; however, the overall number of ribs remains unchanged
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• 3 of 35 heterozygotes lack a processus spinosus on T2
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