Daniel Kerner, a 5-year-old Battens disease patient, holds hands with his dad Marcus Kerner, left, and their family-helper Kristina Pham, right, at his home in Trabuco Canyon, Calif. on Thursday, Oct. 20, 2005. Federal regulators on Thursday approved what would be the first transplant of fetal stem cells into human brains, a procedure that if successful could open the door to treating a host of neural disorders. The transplant recipients will be children who suffer from a rare, fatal genetic disorder.(AP Photo/Sang H. Park)

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