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## Description
The Mok Hok Sok system was discovered as a type 1 toxin-antitoxin system to stabilize plasmid R1 :ref{doi=10.1128/jb.161.1.292-298.1985}. Sok (Suppression of Killing) is an RNA and serves as the antitoxin. Hok (Host killing) is the toxin and Mok (Modulation of killing) is required for the expression of Hok :ref{doi=10.1016/j.mib.2007.03.003, 10.1093/nar/gkl750}.
The Mok Hok Sok system was discovered as a type 1 toxin-antitoxin system to stabilize plasmid R1 :ref{doi=10.1128/jb.161.1.292-298.1985}. Sok (Suppression of Killing) is an RNA and serves as the antitoxin. Hok (Host killing) is the toxin and Mok (Modulation of killing) is required for the expression of Hok :ref{doi=10.1016/j.mib.2007.03.003,10.1093/nar/gkl750}.
Hok/sok are not related to the T4 head protein Hoc and Soc.
This system defends against T4 phages only, as far as we currently know.