Physiology

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hour glass illustration

SLOWING TIME  It’s unlikely we can live forever, but researchers are exploring ways to extend health further into old age. 

lab bioreactor used to grow bone graft

Stem cells from pig fat helped grow bone grafts in a special chamber, shown here.

rat eating

GUT REACTION Research on rats and mice suggests that gut bacteria start the cycle of obesity. The bacteria make a molecule called acetate that sends signals through the vagus nerve to stimulate hunger and fat storage. 

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