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'''Complement C2''' is a [[protein]] that in humans is encoded by the ''C2'' [[gene]].<ref name="entrez">{{cite web | title = Entrez Gene: C2 complement component 2| url = https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=717}}</ref> The protein encoded by this gene is part of the [[classical complement pathway|classical pathway]] of the [[complement system]], acting as a multi-___domain serine protease. Deficiency of C2 has been associated with certain autoimmune diseases.<ref name="entrez"/>
The '''[[Complement component 2|Complement system]]''' is generated to regulate self protection from infection. The overall Complement system is composed of protein groups that collaborate in destroying foreign invaders, which ultimately remove debris from cells and tissues. When the body detects a foreign invader, the body signals the Complement system and the Complement component 2 protein attaches to Complement system 4 resulting in an [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923430/ immune response.] Complement component 2 protein is critical for regulating the body's immune response. The C2 nerves carry messages to muscles involved in neck flexion.
== Function ==
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