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  1. Health & Medicine

    Radiation harms blood vessels before gut

    The side-effects of radiation therapy may result from initial damage to blood vessels.

    By John Travis
  2. Health & Medicine

    Sticky platelets boost blood clots

    Tests for genetic variations of a key protein on platelets, the cell-like blood components that form clots, and their propensity to clump could help physicians determine optimal medication for heart disease patients.

    By Nathan Seppa

  3. Sticky Situations

    Bacteria find strength in numbers as members of huge, mucous-covered communities called biofilms that can stall, equip, and initiate fierce infections.

    By Jessa Netting

  4. Vitamin A calibrates a heart clock, 24-7

    Scientists have discovered a molecular clock that keeps the circulatory system in sync with the rest of the body, and they show it's regulated by vitamin A.