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Definition for antigen was extremely incorrect. Antigen isn't a specialized protein, it doesn't even have to be organic.
An '''antigen''' is a specialized [[protein]], though sometimes it can be a carbohydrate instead. When an antigen is injected into the bloodstream, as through vaccination, it causes the body to produce [[antibodies]]. Having too much antigen in the body can cause [[jaundice]].
An '''antigen''' is any foreign, or unrecognised substance that is capable of inducing an immune response, usually involving the production of [[antibodies]] which bind to, and disable, the antigen. Antigen may be a protein, protein fragment, or even a metallic fragment (for example, due to wearing of a metallic hip replacement). When an antigen is injected into the bloodstream, as through vaccination, it causes the body to produce [[antibodies]].
[[Category:Molecular Biology]]
[[Category:Molecular Biology]]
[[Category:Immunology]]
[[Category:Immunology]]