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Mouse-human hybrid cells that preferentially segregate either mouse or human chromosomes were analyzed for their relative content of mouse and human rRNA genes and for their capacity to transcribe these genes. A distinctive Hind III restriction fragment containing 28S rRNA sequences was used to distinguish between mouse and human rDNA and a set of distinctive loop structures in the 45S pre-rRNA was used to distinguish between mouse and human gene transcripts. Our results indicate that the genes of only one species are transcriptionally active in these hybrid cells, even though both sets of genes are present.
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