Body & Brain

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It’s so hard to turn down just one more muffin, or cupcake, or cookie. Rodent studies reveal why: The mechanisms that control the hunger for and the pleasure from food are inextricably intertwined. 


CHANGING FACE  An immunodeficient man has been excreting live poliovirus for 28 years. His viral strains differ from the one he received in a vaccine. A simulated virus particle shows some of these changes, in surface regions (red) that interact with human immune proteins and elsewhere (blue).   


HIV depletes key immune cells (infected T cell shown above). A new study suggests starting a drug regimen before T cell levels get very low may benefit patients.

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