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This topic might have a better name.
Symbiotic nucleus - We always name our articles in the singular.
Talk about it here.
Symbiotic nuclei were a part of Time Lord cells that allowed for safe time travel. They had some connection to the Rassilon Imprimatur, which all time vessels needed to be primed with for time travel. (TV: The Two Doctors)
Symbiotic nuclei also enabled a Time Lord's ability to regenerate. (PROSE: Love and War)