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Dr. Sheffield is a female Tau'ri Geneticist who works at Stargate Command. When SG-1 captured two Ba'al clones, Lt. Colonel Samantha Carter asked her to examine the DNA of the clones, in an attempt to determine if one of them was the original Ba'al. Unfortunately the samples were identical, and she was unable to determine if either one was the real Ba'al. (SG1: "Insiders")

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