"deimmortalized" meaning in English

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          "ref": "2015 July 15, “TrAmplification of Human Dental Follicle Cells by piggyBac Transposon - Mediated Reversible Immortalization System”, in PLOS ONE, →DOI:",
          "text": "The immortalized DFCs (iDFCs) exhibit higher proliferate activity, which can be reversed to its original level before immortalization when deimmortalized by FLP recombinase.",
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        "simple past and past participle of deimmortalize"
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