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  RADIOLOGY

Catching Cancer Before It Takes Hold
Ralph Weissleder

Imagine sending a tiny probe into the bloodstream with the power to home in on cancers just as they are forming. Imagine also that this microscopic trouble-shooter could not only relay information about what kind of therapeutic approach might best kill the cells, but could later revisit the danger spots and tell whether the treatment was working.

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SOCIAL MEDICINE:
AIDS Study in Africa Shows Decline Amid Growing Epidemic

CELL BIOLOGY:
Gene Related to Tumor Suppressor Linked to Stem Cell Pool