Biology / Bio 3285 · Atom · ~20 seconds
Antibody Classes and Functions
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Antibodies divide into five classes by constant region, each suited to a role: circulating widely, guarding mucosal surfaces, triggering allergic responses, or marking early infection.
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One class crosses the placenta, giving a newborn temporary passive immunity before its own system matures.
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Class describes functional role, not antigen specificity — the same variable region can appear on different classes.