Naturally occurring antibodies are predominantly of which immunoglobulin class?

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Multiple Choice

Naturally occurring antibodies are predominantly of which immunoglobulin class?

Explanation:
Naturally occurring antibodies against ABO antigens are predominantly IgM. These antibodies arise without prior exposure to the antigen and are typically found as pentamers in serum, which gives them high avidity and the ability to cause strong agglutination of red cells even at colder temperatures. This structure makes them ideal for recognizing carbohydrate antigens like A and B and for facilitating immediate agglutination during blood typing. IgG, by contrast, comes mainly after sensitization and can cross the placenta, while IgA and IgE serve other roles in mucosal defense and allergic responses.

Naturally occurring antibodies against ABO antigens are predominantly IgM. These antibodies arise without prior exposure to the antigen and are typically found as pentamers in serum, which gives them high avidity and the ability to cause strong agglutination of red cells even at colder temperatures. This structure makes them ideal for recognizing carbohydrate antigens like A and B and for facilitating immediate agglutination during blood typing. IgG, by contrast, comes mainly after sensitization and can cross the placenta, while IgA and IgE serve other roles in mucosal defense and allergic responses.

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