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Genes & Cells

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macrophages and heart cells

IT’S ELECTRIFYING  Macrophages (green) “plug in” to heart cells (light purple and pink), providing an electrical boost that helps the heart cells contract and pump blood, a study in mice finds.

Hawk moth

FLYING FEEDER  Hawk moths use a lot of energy when they hover to slurp flower nectar. Manduca sexta (shown) can turn some of that nectar into muscle-protecting antioxidants.

Pakistan map

DNA INVESTIGATION  Geneticists examined DNA from more than 10,000 people in Pakistan looking for people in whom both copies of certain genes were nonfunctional. High rates of marriage between closely related people there make it more likely that people will inherit two nonfunctional gene copies.

Genes & Cells

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