IgG is the most common immunoglobulin in the circulatory system and in the extravascular fluid. It is composed of two light chains and two heavy chains. What is the approximate molecular mass of an IgG molecule?
A) 23 kDa
B) 75 kDa
C) 150 kDa
D) 360 kDa
E) 950 kDa
Answer: C) 150 kDa
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