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→Complement fixation
==='''[[Complement|Complement fixation]]'''===
==='''[[Complement|Complement fixation]]'''===
Cross-linking two Fc regions of IgM and IgG by complement component C1q begins the [[Classical Complement Pathway| classical complement pathway]]. As IgM has '''five''' Fc regions it is a much better activator of complement than IgG (as IgG only has '''one''' Fc region).
==Classes==
==Classes==