mortality/aging
• Background Sensitivity: when the founder female (an F2 hybrid of C57BL/6J and DBA/2J) is crossed to the outbred CD-1 strain, a few females survive until maturity
• Background Sensitivity: female survival is reduced to less than 2 weeks of age after backcrossing the founder female into the C57BL/6J strain
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craniofacial
• a retrognathic mandible is evident at birth
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• a shortened, poorly formed mandible is evident at birth
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• a poorly formed maxilla is evident at birth
• however, no cleft secondary palates are observed
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pointed snout
(
J:18214
)
|
growth/size/body
pointed snout
(
J:18214
)
|
microcephaly
(
J:18214
)
• at birth, the head is slightly smaller than normal in all dimensions
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• surviving females display severe growth retardation
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limbs/digits/tail
kinked tail
(
J:18214
)
|
reproductive system
• surviving females produce infrequent litters
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• surviving females produce small litters, which become extinct in the fourth generation
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skeleton
• a retrognathic mandible is evident at birth
|
• a shortened, poorly formed mandible is evident at birth
|
• a poorly formed maxilla is evident at birth
• however, no cleft secondary palates are observed
|
• surviving females exhibit spinal kinks, first evident in the tail but arising at multiple sites
• in the spinal kink regions, the bone is surrounded by an inflammatory cell infiltrate composed of histiocytes and neutrophils; however, no neoplasia is observed and the finding is diagnosed as cellulitis
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behavior/neurological
• adult females often display a hunched posture, as a result of multiple spinal kinks
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vision/eye
integument
• adult females display patchy hair growth
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• in adulthood, some areas in the coat are devoid of hair follicles
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wrinkled skin
(
J:18214
)
• surviving females display a remarkably wrinkled skin prior to fur growth
|