San Francisco 49ers linebackers NaVorro Bowman (53) and Patrick Willis (52) practice 

San Francisco 49ers linebackers NaVorro Bowman (53) and Patrick Willis (52) practice at an NFL football training facility in Santa Clara, Calif., Wednesday, Jan. 23, 2013. The 49ers are scheduled to play the Baltimore Ravens in Super Bowl XLVII on Sunday, Feb. 3. (AP Photo/Jeff Chiu)
Associated Press
San Francisco 49ers linebackers NaVorro Bowman (53) and Patrick Willis (52) practice at an NFL football training facility in Santa Clara, Calif., Wednesday, Jan. 23, 2013. The 49ers are scheduled to play the Baltimore Ravens in Super Bowl XLVII on Sunday, Feb. 3. (AP Photo/Jeff Chiu)
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