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Body & Brain

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BATTLING BACK  Antibiotics such as penicillin attack a bacterium’s cell wall, bursting it (left, shown next to an intact Staphylococcus aureus cell in false color). Some studies suggest that antibiotics also trigger other kinds of damage that could be harnessed in the battle against antibiotic resistance.

For people with a specific gene variant, eating a lot of processed meat may increase their risk of getting colon cancer.

Chemical signals sent between mammalian sperm's Izumo1 protein and the egg protein Juno or Folr4 ensure that the reproductive cells fuse.

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