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The Arizona Cardinals have discovered the source of the leg pain John Brown has been experiencing for the better part of the last two seasons: The wide receiver has a sickle-cell trait, per the team's official website.
The Cardinals had previously believed that Brown was having hamstring issues, and had listed him on their injury report several times with information reflecting that. But when MRIs did not turn up anything in his hamstrings, the Cardinals looked elsewhere for causes and performed blood tests.