3 of 12: W.P. Andrew Lee, M.D. talks about the bilateral arm transplant on Infantryman Brendan M. Marrocco during a news conference Tuesday, Jan. 29. 2013 at Johns Hopkins hospital in Baltimore. Marrocco received a transplant of two arms from a deceased donor after losing all four limbs in a 2009 roadside bomb attack in Iraq. (AP Photo/Gail Burton)

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