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Complementary DNA, transcribed in vitro from purified rabbit globin messenger RNA and made double-stranded, has been inserted into Escherichia coli plasmids pSC101 and pMB9 by the poly(dT)/poly(dA) "tailing" and annealing technique. E. coli transformants given by this DNA preparation have been shown to contain globin sequences by the hybridization of globin RNA to DNA from clones grown and lysed in situ on nitrocellulose filters. An estimate of the amount of inserted globin sequences has been provided by fingerprint analysis of globin mRNA sequences hybridized to the purified plasmid chimeras. Inserted sequences so far subjected to detailed analysis have been ascribed to the rabbit beta globin chain. The susceptibility of inserted beta globin, sequences to the restriction endonuclease EcoRI confirms the existence of a site already found through previous nucleotide sequence analysis.
Higuchi et al. (Wed,) studied this question.
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