Researchers found that a protein in human umbilical cord blood plasma improved learning and memory in older mice, but there's no indication it would work in people.
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This image shows a human glial cell (green) among normal mouse glial cells (red). The human cell is larger, sends out more fibers and has more connections than do mouse cells. Mice with this type of human cell implanted in their brains perform better on learning and memory tests than do typical mice.
Courtesy of Steven Goldman