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Analysis of cI-lacZ mRNA by Northern hybridization. Autoradiogram of size-fractionated in vivo RNA probed for cI-lacZ mRNA. Arrows indicate predicted positions of full-length mRNA (FL), 23S, and 16S rRNA. Lanes are labeled according to total in vivo RNA extracted from the E. coli RFS859 host strain (RFS) or the host strain containing plasmids expressing cI-lacZ fusions described in Table 1.
