(19)

(11)

EP 0 031 381 A1

(12)

(43) Date of publication: 08.07.1981 Bulletin 1981/27 (21) Application number: 80901558.0 (22) Date of filing: 07.07.1980

(51) International Patent Classification (IPC):  C07K 14/ 555( . ) G01N 33/ 68( . ) (86) International application number: PCT/US1980/000842 (87) International publication number: WO 1981/000116 (22.01.1981 Gazette 1981/02)

(84) Designated Contracting States: CH DE FR GB LI SE (30) Priority: 05.07.1979 US 19790055053 (71) Applicant: UNITED STATES RESEARCH CORPORATION Baltimore, MD 21215 (US)	(72) Inventors: ROBINSON, William L., Jr. Baltimore, MD 21215 (US) HURTT, John R. Baltimore, MD 21215 (US)