| http://www.w3.org/ns/prov#value | - Preferably, the animal is not an embryo, and most preferably the animal is an adult. [0073] Another aspect of the present invention provides a method of treating or ameliorating a neurodegenerative disease or medical condition, comprising (a) administering to a mammal a factor which is capable of increasing the number of neural stem cells; and (b) subjecting the mammal to a condition which enhance
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