mortality/aging
• 63% of double heterozygous mice, in which the Myf5 and Myf6 alleles are on different chromosomes and show severely reduced expression of Myf5, die immediately after birth; the rest survive
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skeleton
• attachment failure of at least one rib to the sternum is seen in most mutants, although the identity of the affected rib(s) and the number of ribs affected varies
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• abnormal ribs
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muscle
• number of myocytes in the myotomes is reduced at E10.5 and the conformation of the myotome is abnormal
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