Nerve-cell transplants help brain-damaged rats fully recover lost ability to learn, critical confirmation. Brain cell grafts do stimulate release of growth factors for neurons, regenerate or reorganize part of the brain, and restore cognitive function, in a process called neural plasticity. Study focused on the hippocampus, considered to be the seat of learning and memory. Further study is needed, especially to understand the underlying repair mechanism and the apparent starring role of growth factor in brain health.

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