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A CHANGE OF VENUE

Human astrocytes (large yellow-green cells with white nuclei) grow in the brain of a 10-month-old mouse. Mouse cell nuclei are stained blue. Mice with human astrocytes implanted in their brains perform better on learning and memory tests than normal mice do, suggesting that human astrocytes are better than their rodent counterparts at modulating learning. Credit: X. Han et al/Cell Stem Cell 2013

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