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Examination of an abortus from a 13 week miscarriage revealed a fetus of around 9 weeks developmental age with multiple abnormalities including microcephaly, iniencephaly and encephalocele continuous with cervical and thoracic spina bifida, whose karyotype was subsequently shown to be 47,XY, + 2.
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Seller et al. (2003) studied this question.
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