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Jon Kitna (back) not practicing again

IRVING, Texas -- Backup quarterback Jon Kitna isn't practicing for the second consecutive day due to a sore back.

Kitna's injury could result in No. 3 quarterback Stephen McGee being on the gameday roster Sunday. McGee has been inactive four of the previous five games.

The Cowboys listed Kitna as doubtful.

The 39-year-old Kitna has only taken meaningful snaps in one game this season. He completed six of 10 passes for 87 yards and a touchdown with two interceptions while Tony Romo was treated for a broken rib during the Sept. 18 comeback win over the San Francisco 49ers.