Cloning and sequencing of cDNA for mouse liver metallothionein-I

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Abstract

Metallothionein mRNA was purified from liver of mice injected with cadmium. The corresponding double-stranded cDNA was prepared and inserted into the PstI site of plasmid pBR322. The resulting recombinant DNA was used to transform the RR1 strain of Escherichiacoli. Clones resistant to tetracycline and sensitive to ampicillin were screened for the presence of metallothionein-specific restriction fragments in their plasmids. One plasmid, called M135, contains a cDNA insert covering the entire length of the mRNA for mouse liver metallothionein-I, except for the first 18 bases at the 5′ end.

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