Lindos
From Tardis Wiki, the free Doctor Who reference
Lindos was a hormone related to the random and erratic process of Time Lord regeneration.
When triggered, a massive release of the hormone was transported at lightning speed around the body, causing its cells to reform and realign themselves. (PROSE: The Twin Dilemma)
Measurement of lindos levels could determine how recently a Time Lord had regenerated. (AUDIO: Unregenerate!)
