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EXTRA EXTRA  An extra chromosome can help suppress the effects of cancer mutations, new research suggests. The findings may help explain why people with Down syndrome, who have an extra copy of chromosome 21 in their cells, have low cancer rates.

buruli ulcer

FOREST CHANGE  Clearing forests and changing landscapes might affect how many people develop Buruli ulcer. The disease is caused by bacteria shown here (in red) in a section of otherwise healthy mouse tissue (in blue).

amyloid-beta comparison

RIDE THE WAVES Compared with a mouse that received random brain stimulation (right), a mouse stimulated to produce more gamma waves (left) had less amyloid-beta (green) in its hippocampus.

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