Find many useful suggestions increasing sensitivity of ELISA in the paper Kricka, L. 1994 Clin. Chem 40(3):347-357 ================================= Mick Blake Utah State University Dept. of Nutrition and Food Sciences Logan, UT. 84322-8700 lab voice = 801-797-2123 dept. fax = 801-797-2379 E-mail = SLTJP at cc.USU.edu =================================