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This has not been established. It is known that some Time Lords can influence the outcome of their regeneration (i.e. Romana in "Destiny of the Daleks"), or have it influenced for them (as in "The Night of the Doctor"), and the Tenth Doctor experienced a scenario where he was able to partially regenerate and yet keep his form ("Journey's End"). The closest we've seen is the Master appears dismayed that he did not change his appearance after his resurrection in "The End of Time".