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Thornton (hamstring) made his return to Cowboys' practice Wednesday, David Helman of the Cowboys' official website reports.
Thornton has been bothered by a hamstring injury for several weeks but is seemingly feeling better. It's unlikely the Cowboys would allow the 29-year-old to participate in practice unless they were comfortable with his health. However, with all the time he has missed during training camp, his starting role could potentially be in jeopardy.
