Two major informants play central roles in the searing report on steroid use in baseball, released yesterday by former Sen. George Mitchell.

Kirk Radomski, a former Mets clubhouse attendant, and Brian McNamee, a former strength trainer for the Yankees and Blue Jays, provided much of the information linking players to drug use. The document named 89 players, including superstars Roger Clemens, Barry Bonds, Jose Canseco and Jason Giambi.