Hok/sok System
An example of a system found in nature that utilizes an antisense RNA to control gene regulation. The hok gene is a toxic gene that can be translationally repressed by the production of an antisense mRNA, sok (anti toxic).
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"Hok sok system R1 plasmid present."
http://en.wikipedia.org/wiki/File:Hok_sok_system_R1_plasmid_present.gif
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