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Amanda Knox back in court for appeal trial

Alberto Pizzoli / AFP - Getty Images

Amanda Knox reacts in court before the start of a session of her appeal trial in Perugia, Italy, on July 25. Knox was sentenced in December 2009 to 26 years in prison for the 2007 killing of British student Meredith Kercher.

Keith Miller of NBC News reports from Perugia, Italy:

American college student Amanda Knox was convicted of murder based on DNA evidence, which is now being questioned by experts. NBC's Keith Miller reports.