Human embryonic stem cells injected directly into the hippocampus of irradiated rats improved the animals' memory four months after the treatment, a study said. The rats were euthanized after the study, and the researchers found that the stem cells grew into neurons and astrocytes -- a type of brain cell. The findings suggest that embryonic stem cells could help recover short-term memory loss and improve long-term memory among cancer patients who underwent radiation therapy, the researchers said.

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