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Zack Martin ruled out by Cowboys due to concussion

Just as the Cowboys welcomed All-Pro left tackle Tyron Smith?back from a two-game absence because of a groin strain, they lost All-Pro right guard Zack Martin to a concussion in the second quarter of Thursday's 28-6 loss?to the Chargers.? Martin was staggered on a run by Rod Smith but remained in the game for the next four plays. Martin entered Thursday having played 661 of a possible 673 snaps on the season.