Bills receiver Stevie Johnson is practicing today and feels better than the past two weeks, when he rested his sore groin on the first day of game-week preparation. The Bills were without center Eric Wood and outside linebacker Shawne Merriman. Both were in the locker room walking around OK and talking to the media, so the presumption is their ailments are minor. Also watching practice were running back C.J. Spiller and linebackers Nick Barnett and Chris White. Left tackle Demetrius Bell, out with a shoulder injury, was absent. So was cornerback Aaron Williams (collarbone). Receiver Ruvell Martin was watching. Spiller tweaked a leg late in the game but is expected to be ready for Philadelphia Sunday. Barnett is expected to be ready, too.