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{{technical|date=December 2021}}
{{short description|Antibody isotype}}
[[File:IgG molecular surface.jpg|thumb|The water-accessible surface area of an IgG antibody]]
'''Immunoglobulin G''' ('''Ig G''') is a [[Antibody#Classes|type]] of [[antibody]]. Representing approximately 75% of [[blood plasma|serum]] antibodies in humans, IgG is the most common type of antibody found in [[Circulatory system|blood circulation]].<ref>{{Cite journal|last1=Vidarsson|first1=Gestur|last2=Dekkers|first2=Gillian|last3=Rispens|first3=Theo|date=2014|title=IgG subclasses and allotypes: from structure to effector functions|journal=Frontiers in Immunology|volume=5|pages=520|doi=10.3389/fimmu.2014.00520|issn=1664-3224|pmc=4202688|pmid=25368619|doi-access=free}}</ref> IgG molecules are created and released by [[plasma B cell]]s. Each IgG antibody has two [[paratope]]s.
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