GP5 could refer to several things:
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GP5 (gene)
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T7 phage
Bacteriophage T7 (or the T7 phage) is a bacteriophage, a virus that infects bacteria. It infects most strains of ''Escherichia coli'' and relies on these hosts to propagate. Bacteriophage T7 has a lytic life cycle, meaning that it destroys th ...
, or Gp5
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GP5 chip, computer chip
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GP-5 gas mask, Soviet civilian gas mask
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