| Level | Code | Display | Definition | 
 | 1 | AB  | Abbott Laboratories (includes Ross Products Division) | 
                        Abbott Laboratories (includes Ross Products Division) 
                      | 
 | 1 | AD  | Adams Laboratories | 
                        Adams Laboratories 
                      | 
 | 1 | ALP  | Alpha Therapeutic Corporation | 
                        Alpha Therapeutic Corporation 
                      | 
 | 1 | AR  | Armour [Inactive - use CEN] | 
                        Armour [Inactive-use CEN] 
                      | 
 | 1 | AVI  | Aviron | 
                        Aviron 
                      | 
 | 1 | BA  | Baxter Healthcare Corporation | 
                        Baxter Healthcare Corporation 
                      | 
 | 1 | BAY  | Bayer Corporation (includes Miles, Inc. and Cutter Laboratories) | 
                        Bayer Corporation (includes Miles, Inc. and Cutter Laboratories) 
                      | 
 | 1 | BP  | Berna Products [Inactive - use BPC] | 
                        Berna Products [Inactive-use BPC] 
                      | 
 | 1 | BPC  | Berna Products Corporation (includes Swiss Serum and Vaccine Institute Berne) | 
                        Berna Products Corporation (includes Swiss Serum and Vaccine Institute Berne) 
                      | 
 | 1 | CEN  | Centeon L.L.C. (includes Armour Pharmaceutical Company) | 
                        Centeon L.L.C. (includes Armour Pharmaceutical Company) 
                      | 
 | 1 | CHI  | Chiron Corporation | 
                        Chiron Corporation 
                      | 
 | 1 | CON  | Connaught [Inactive - use PMC] | 
                        Connaught [Inactive-use PMC] 
                      | 
 | 1 | EVN  | Evans Medical Limited (an affiliate of Medeva Pharmaceuticals, Inc.) | 
                        Evans Medical Limited (an affiliate of Medeva Pharmaceuticals, Inc.) 
                      | 
 | 1 | GRE  | Greer Laboratories, Inc. | 
                        Greer Laboratories, Inc. 
                      | 
 | 1 | IAG  | Immuno International AG | 
                        Immuno International AG 
                      | 
 | 1 | IM  | Merieux [Inactive - use PMC] | 
                        Merieux [Inactive-use PMC] 
                      | 
 | 1 | IUS  | Immuno-U.S., Inc. | 
                        Immuno-U.S., Inc. 
                      | 
 | 1 | JPN  | The Research Foundation for Microbial Diseases of Osaka University (BIKEN) | 
                        The Research Foundation for Microbial Diseases of Osaka University (BIKEN) 
                      | 
 | 1 | KGC  | Korea Green Cross Corporation | 
                        Korea Green Cross Corporation 
                      | 
 | 1 | LED  | Lederle [Inactive - use WAL] | 
                        Lederle [Inactive-use WAL] 
                      | 
 | 1 | MA  | Massachusetts Public Health Biologic Laboratories | 
                        Massachusetts Public Health Biologic Laboratories 
                      | 
 | 1 | MED  | MedImmune, Inc. | 
                        MedImmune, Inc. 
                      | 
 | 1 | MIL  | Miles [Inactive - use BAY] | 
                        Miles [Inactive-use BAY] 
                      | 
 | 1 | MIP  | Bioport Corporation (formerly Michigan Biologic Products Institute) | 
                        Bioport Corporation (formerly Michigan Biologic Products Institute) 
                      | 
 | 1 | MSD  | Merck and Co., Inc. | 
                        Merck & Co., Inc. 
                      | 
 | 1 | NAB  | NABI (formerly North American Biologicals, Inc.) | 
                        NABI (formerly North American Biologicals, Inc.) 
                      | 
 | 1 | NAV  | North American Vaccine, Inc. | 
                        North American Vaccine, Inc. 
                      | 
 | 1 | NOV  | Novartis Pharmaceutical Corporation (includes Ciba-Geigy Limited and Sandoz Limited) | 
                        Novartis Pharmaceutical Corporation (includes Ciba-Geigy Limited and Sandoz Limited) 
                      | 
 | 1 | NYB  | New York Blood Center | 
                        New York Blood Center 
                      | 
 | 1 | ORT  | Ortho Diagnostic Systems, Inc. | 
                        Ortho Diagnostic Systems, Inc. 
                      | 
 | 1 | OTC  | Organon Teknika Corporation | 
                        Organon Teknika Corporation 
                      | 
 | 1 | PD  | Parkedale Pharmaceuticals (formerly Parke-Davis) | 
                        Parkedale Pharmaceuticals (formerly Parke-Davis) 
                      | 
 | 1 | PMC  | Aventis Pasteur Inc. (formerly Pasteur Merieux Connaught; includes Connaught Laboratories and Pasteur Merieux) | 
                        Aventis Pasteur Inc. (formerly Pasteur Merieux Connaught; includes Connaught Laboratories and Pasteur Merieux) 
                      | 
 | 1 | PRX  | Praxis Biologics [Inactive - use WAL] | 
                        Praxis Biologics [Inactive-use WAL] 
                      | 
 | 1 | SCL  | Sclavo, Inc. | 
                        Sclavo, Inc. 
                      | 
 | 1 | SI  | Swiss Serum and Vaccine Inst. [Inactive - use BPC] | 
                        Swiss Serum and Vaccine Inst. [Inactive-use BPC] 
                      | 
 | 1 | SKB  | SmithKline Beecham | 
                        SmithKline Beecham 
                      | 
 | 1 | USA  | United States Army Medical Research and Materiel Command | 
                        United States Army Medical Research and Materiel Command 
                      | 
 | 1 | WA  | Wyeth-Ayerst [Inactive - use WAL] | 
                        Wyeth-Ayerst [Inactive-use WAL] 
                      | 
 | 1 | WAL  | Wyeth-Ayerst (includes Wyeth-Lederle Vaccines and Pediatrics, Wyeth Laboratories, Lederle Laboratories, and Praxis Biologics) | 
                        Wyeth-Ayerst (includes Wyeth-Lederle Vaccines and Pediatrics, Wyeth Laboratories, Lederle Laboratories, and Praxis Biologics) 
                      |