Microcheck 177

Radioimmunoassay uses a radioactive label to detect antigens or antibodies, whereas enzymes

Figure 17.11 The Western Blot Test that give a color reaction are used as labels in the enzyme-linked immunosorbent assay, ELISA. The Western blot technique combines electrophoresis with ELISA to separate and identify protein antigens in a mixture.

■ Give examples of uses for RIA, ELISA, and Western blot tests.

■ Why is the RIA highly sensitive?

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