Natural antibodies tend to react best at which temperature?

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Multiple Choice

Natural antibodies tend to react best at which temperature?

Explanation:
Natural antibodies against A and B are mainly IgM and exist without prior exposure to the antigens. They are cold-reactive, with binding and agglutination strongest at very low temperatures. At 4°C, these antibodies pair efficiently with the A and B antigens on red cells, producing clear agglutination. As the temperature increases toward body temperature, their reactivity diminishes, so they react best at 4°C rather than at higher temps like 37°C, 20°C, or 25°C.

Natural antibodies against A and B are mainly IgM and exist without prior exposure to the antigens. They are cold-reactive, with binding and agglutination strongest at very low temperatures. At 4°C, these antibodies pair efficiently with the A and B antigens on red cells, producing clear agglutination. As the temperature increases toward body temperature, their reactivity diminishes, so they react best at 4°C rather than at higher temps like 37°C, 20°C, or 25°C.

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