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Purity of recombinant p15E. Mean OD values of a positive and a negative cat control serum sample and three E. coli serum samples (nos. 1 to 3) tested with antibody ELISAs using the recombinant p15E cloning product as antigen. Compared to the positive and negative controls, E. coli samples 1 to 3 reached only low OD levels (<0.117).
