(19)

(11)

EP 0 504 244 A1

(12)

(43) Date of publication: 23.09.1992 Bulletin 1992/39 (21) Application number: 91900873.0 (22) Date of filing: 07.12.1990

(51) International Patent Classification (IPC):  A01K 67/ 027( . ) G01N 33/ 68( . ) (86) International application number: PCT/GB1990/001910 (87) International publication number: WO 1991/009120 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 09.12.1989 GB 19890027908 (71) Applicant: MEDICAL RESEARCH COUNCIL London W1N 4AL (GB)	(72) Inventors: RICHARDS, Sarah-Jane Kings Parade Cambridge CB1 1ST (GB) DUNNETT, Stephen, Bruce Trinity Lane Cambridge CB2 1TR (GB) (74) Representative: Matthews, Heather Clare  Keith W Nash & Co Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP Cambridge CB2 1DP (GB)