DNA expert links needle, cotton swabs to Clemens

WASHINGTON (Reuters) - A DNA expert in the perjury trial of Roger Clemens testified he matched the former pitching ace's genetic profile to articles of medical waste kept by the trainer who says he injected Clemens with performance-enhancing drugs.

Source: http://feeds.reuters.com/~r/reuters/sportsNews/~3/GsXNWy6CNO4/us-usa-clemens-idUSBRE84O0QE20120526

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