Final answer:
The most abundant antibody found in serum is IgG-1, representing approximately 75% of serum antibodies in humans.
Explanation:
The most abundant antibody found in serum is IgG-1. IgG is the most common type of antibody in the circulation, representing approximately 75% of serum antibodies in humans. It is a monomer with 2 Fab sites and is versatile in function.
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