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Genes & Cells

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macaroni penguins

MISMATCHED OFFSPRING When macaroni penguins convene at a breeding site (shown), females lay some of the most size-mismatched eggs known among birds.

chromosome

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.

mouse microglia

GUT IMPULSE Signals from gut microbes can activate immune cells called microglia (shown here in green) in the mouse brain, causing inflammation that’s characteristic of Parkinson’s disease.

Genes & Cells

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