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DescriptionComplement pathway.png	The complement system is made up of about 25 proteins that work together to “complement” the action of antibodies in destroying bacteria. Complement proteins circulate in the blood in an inactive form. When the first protein in the complement series is activated— typically by antibody that has locked onto an antigen—it sets in motion a domino effect. Each component takes its turn in a precise chain of steps known as the complement cascade. The end product is a cylinder inserted into—and puncturing a hole in—the cell’s wall. With fluids and molecules flowing in and out, the cell swells and bursts.
Date	NIH Publication No. 03–5423, September 2003 (modifications: September 4, 2006)
Source	The Immune System (pdf)
Author	Template drawing and caption from "The Immune System", any modifcations, made by myself are released into the public domain.
Permission (Reusing this file)	Original work of the US Federal Government - public domain
Other versions	[edit] SVG: English Russian PNG: Catalan English Estonian Galician Kurdish Japanese

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Federal Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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Category:PD-user#Complement%20pathway.png Category:Microbiology Category:Biology diagrams Category:Immunology