 Also seen in "Journey's End", is the apparent ability to siphon off regeneration energy in order to cancel the effect of changing appearance; which requires them to have a "bio-matching receptacle" (in this case the Doctor's severed hand), which is usually impractical.However, this "non-regeneration" was revealed as "counting" towards the Doctor's twelve possible regenerations during the events of "The Time of the Doctor".<ref></ref>

In "The End of Time", the Tenth Doctor was able to postpone his regeneration long enough so that he could travel in time and space to see his past companions for one last time before he regenerated.The Fifth Doctor also showed a similar ability in his final televised story "The Caves of Androzani".