免疫球蛋白特性
IgG 的含量是免疫球蛋白中最高的。
IgG has the highest concentration among immunoglobulins.
IgD 主要存在於 B 細胞表面，其功能仍未完全清楚，但與 B 細胞的活化有關。
IgD is primarily found on the surface of B cells and its function is still not fully understood, but it is associated with B cell activation.
IgE 主要參與過敏反應，當身體接觸到過敏原時，IgE 會與肥大細胞結合，釋放組織胺等物質，引起過敏反應。
IgE is primarily involved in allergic reactions. When the body comes into contact with an allergen, IgE binds to mast cells, releasing substances such as histamine, causing allergic reactions.
IgM 是免疫反應中最早出現的抗體，當身體首次接觸抗原時，會先產生 IgM。隨後，如果持續受到抗原刺激，會產生親和力更高的 IgG。
IgM is the first antibody to appear in an immune response. When the body first encounters an antigen, IgM is produced first. Subsequently, if the body continues to be stimulated by the antigen, IgG with higher affinity is produced.
IgA 能透過母乳提供新生兒免疫保護能力，能夠黏附在黏膜表面，形成一道防線，阻擋病原體入侵，因此可以有效預防呼吸道及腸胃道感染。黏膜表面如呼吸道、腸胃道、唾液、淚液等
IgA can be transferred to newborns through breast milk and can bind to mucosal surfaces, forming a barrier to block the invasion of pathogens, thus effectively preventing respiratory and gastrointestinal infections. Mucosal surfaces include the respiratory tract, gastrointestinal tract, saliva, and tears.
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