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4. This ELISA method coats a 96 well plate with the antigen cocaine. If the patients serum contains antibodies for cocaine,
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Only one type of antibody is used in direct ELISA.

ELISA - Enzyme Linked Immuno Sorbent Assay. In direct ELISA, only one type of antibody is utilized. In other two types - indirect ELISA and sandwich ELISA two antibodies are used.

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