(19)

(11)

EP 0 486 602 A1

(12)

(43) Date of publication: 27.05.1992 Bulletin 1992/22 (21) Application number: 90913048.0 (22) Date of filing: 13.08.1990

(51) International Patent Classification (IPC):  A01K 67/ 033( . ) A01N 1/ 02( . ) A01N 1/ 00( . ) G01N 33/ 50( . ) (86) International application number: PCT/GB1990/001268 (87) International publication number: WO 1991/001637 (21.02.1991 Gazette 1991/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 11.08.1989 GB 19890018370 24.08.1989 GB 19890019250 (71) Applicant: CELL SYSTEMS LIMITED Cambridge CB4 4WY (GB)	(72) Inventors: GROUT, Brian, William, Wilson Littleport Cambridgeshire CB6 2EJ (GB) McFADZEN, Ian, Robert, Bruce Manchester M22 5DC (GB) (74) Representative: Sheard, Andrew Gregory  Kilburn & Strode 30, John Street London WC1N 2DD London WC1N 2DD (GB)