Glowing Pigs

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Scientists have genetically modified three pigs so that they are thoroughly florescent both in daylight and in darkness. Pigs have been modified in this fashion before, but the scientists who have created the most recent set observe that their technique has improved the odds of successfully modifying a specific embryo and making the adult pig completely florescent. The presence of the green protein will allow genetically modified cells to be tracked if they were transplanted into a human. This will immediately speed scientists' understanding of genetic research for the purpose of improving human health.

Which of the following would be most useful to determine in evaluating the claim above?