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Mullen (illness) was a full participant during Wednesday's walkthrough, Todd Archer of ESPN.com reports.

Mullen was sidelined for the Cowboy's wild-card win over Tampa Bay on Monday Night due to an illness, but he's since moved past the issue and should suit up for Sunday's divisional-round matchup against the 49ers. However, the veteran cornerback isn't expected to garner a major role during the playoff contest, as he's made just one appearance for Dallas this season.

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