4.3 Immunology Provides Important Techniques with Which to Investigate Proteins -- Biochemistry -- NCBI Bookshelf

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Figure 4.35

Indirect ELISA and Sandwich ELISA

(A) In indirect ELISA, the production of color indicates the amount of an antibody to a specific antigen. (B) In sandwich ELISA, the production of color indicates the quantity of antigen. [After R. A. Goldsby, T. J. Kindt, B. A. Osborne, Kuby Immunology, 4th ed. (W. H. Freeman and Company, 2000), p. 162.]