Examination of Dr. X's body reveals a Hellerium metabolism, similar but distinct to our own. When inquired, Dr. X explains that she was born as a true pureblood, but transformed herself with the power of science. Now her body is not only stronger, but also gained some qualities similar to higher Zombie forms, like Strixes, being able to produce the rejuvenating 'Zombie Juice'. As for the question why, Dr. X gets quite embarrassed before revealing she expressly wanted to be able to experience extremes and survive it. She did avoid these extremes, though; as she says, she was afraid of losing herself.