PQ
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PQ is the following:
- In Canadian politics, PQ is the Parti Québécois, a left wing political party that advocates national sovereignty for Quebec from Canada.
- PQ is a former abbreviation for "Province of Quebec" or Province du Québec, now replaced as a postal abbreviation by "QC."
- In biochemistry, PQ is plastoquinone, a molecule used in the electron transport chain in the light-dependent reactions of photosynthesis.