Question
A/an ____ occurs when the immune system overreacts to a harmless substance known as an allergen.
Answer
A/an allergic reaction occurs when the immune system overreacts to a harmless substance known as an allergen.
Think of mass cells and IgE
* remeber IgM has many sides (its in the begining) and IgG is like a gaping hole (used for endocytosis at the end)
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