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Nuclei assembled in vitro from Xenopus egg extracts and DNA display many properties known from in vivo nuclei. However, the distribution pattern of DNA in such nuclei remains unknown. We introduced rDNA from Tetrahymena macronuclei into Xenopus egg extracts and examined the association of specific DNA sequences with the nuclear matrix(NM) of the nuclei formed. We found that the 5′ non-transcribed...
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