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Summary Using mice that were mosaics for both Xce and phosphoglycerate kinase ( Pgk -1) alleles, we have established that the parental source of the Xce gene may affect the probability with which the X chromosome carrying it will remain active. This effect was seen in one allelic combination of Xce but not in another. The relationship between these effects and other phenomena of maternal ‘imprinting’ is discussed.
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Forrester et al. (1985) studied this question.
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