| http://www.w3.org/ns/prov#value | - Various plasmid-based expression vectors contain specific regulatory regions derived from SV-40, the most commonly used being a 300 bp segment which lies between the viral early and late transcription units and containing a number of different controlling cis elements, including the DNA origin of replications and promoters, and sites of initiation of transcription of early and late mRNAs (5).
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