In this April 4, 2010 photo provided by Marine Sgt. Ron Strang, Strang lies on the ground after being hit by shrapnel in a bomb blast in Marja, Afghanistan. He lost half of his left thigh muscle and has had it strengthened with an experimental implant of connective tissue developed from pigs. "It's been a huge improvement," he says. He is taking part in a study at University of Pittsburgh Medical Center. (AP Photo/Ron Strang)

Associated Press
In this April 4, 2010 photo provided by Marine Sgt. Ron Strang, Strang lies on the ground after being hit by shrapnel in a bomb blast in Marja, Afghanistan. He lost half of his left thigh muscle and has had it strengthened with an experimental implant of connective tissue developed from pigs. "It's been a huge improvement," he says. He is taking part in a study at University of Pittsburgh Medical Center. (AP Photo/Ron Strang)
In this April 4, 2010 photo provided by Marine Sgt. Ron Strang, Strang lies on the ground after being hit by shrapnel in a bomb blast in Marja, Afghanistan. He lost half of his left thigh muscle and has had it strengthened with an experimental implant of connective tissue developed from pigs. "It's been a huge improvement," he says. He is taking part in a study at University of Pittsburgh Medical Center. (AP Photo/Ron Strang)
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