Buffalo Bills WR Percy Harvin (illness) and CB Ronald Darby (concussion) did not participate in practice Thursday, Dec. 1. LBs Lorenzo Alexander (ankle), Preston Brown (wrist), Ss Sergio Brown (hamstring), James Ihedigbo (ankle), OL Richie Incognito (neck), Cordy Glenn (back), John Miller (shoulder), WR Marquise Goodwin (wrist), and DT Marcell Dareus (abdomen) practiced on a limited basis, while LB Zach Brown (hand) was a full participant.