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Mutant human was a variant of human which existed in a time period in the future relative to Clara Oswald's home time. Saibra identified as a mutant human, possessing the ability to change form by replicating living cells she came into contact with. (TV: Time Heist)
The "C-RAD" (which stood for "cellular remission and decay") were a type of mutant humans, coloquially known as "Ugly Mutants". Xais was the last of them. (AUDIO: The Romance of Crime)