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- The goal of the pigoon project was to grow an assortment of foolproof human-tissue organs in a transgenic knockout pig host — organs that would transplant smoothly and avoid rejection, but would also be able to fend off attacks by opportunistic microbes and viruses, of which there were more strains every year.p. 22.7
There are no more uses of "opportunistic" in Oryx and Crake.
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