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Mariota (quadriceps) missed practice Wednesday, Paul Gutierrez of ESPN.com reports.

Mariota injured his quadriceps in his only snap in Monday's season-opening win over the Ravens. The quarterback was able to run for a big gain early in the game, which resulted in his injury. If Mariota is unable to play Sunday against the Steelers, expect Nathan Peterman to takeover as Derek Carr's backup.

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