Which region of the IgG molecule serves as the binding site for the complement system?

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Variable region of the light chainConstant region of the light chainFirst constant region of the heavy chainSecond constant region of the heavy chainNone of the above

Explanation

The complement system attaches to the IgG antibody at the CH2 domain, which is the second constant region of the heavy chain. Other regions such as the variable light (VL), constant light (CL), or first constant heavy (CH1) domains are not involved in complement binding.