(19)

(11)

EP 0 594 606 A1

(12)

(43) Date of publication: 04.05.1994 Bulletin 1994/18 (21) Application number: 91906527.0 (22) Date of filing: 05.02.1991

(51) International Patent Classification (IPC):  C12Q 1/ 00( . ) G01N 33/ 532( . ) G01N 33/ 543( . ) C12Q 1/ 68( . ) G01N 33/ 542( . ) G01N 33/ 58( . ) (86) International application number: PCT/GB1991/000165 (87) International publication number: WO 1991/012530 (22.08.1991 Gazette 1991/19)

(84) Designated Contracting States: AT BE CH DE DK FR GB IT LI LU NL SE (30) Priority: 16.02.1990 GB 19900003593 (71) Applicant: PA Consulting Services Limited London SW1X 7LE (GB)	(72) Inventors: BAINS, William Arthur Melbourn, Herts SG8 6BW (GB) GOLBY, John Andrew Hartford, Huntingdon PE18 7YG (GB) (74) Representative: Matthews, Heather Clare  Keith W Nash & Co Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP Cambridge CB2 1DP (GB)