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[Doctor Who] How do the Doctor's enemies keep track of which Doctor is which?
(self.asksciencefiction)
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With the Daleks, I suppose you could say that they've studied the Time Lords well enough to detect the, oh I dunno, chrono-telomeres or whatever that actually determine whether or not a Time Lord has any regenerations left. shrugs
This would most likely be the in universe answer. Some techno babble said extremely fast that you never hear again for 50 years.
I mean two hearts would do it in most cases. Or just DNA actually.