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Questions tagged [antigen]

An antigen is a substance which causes the the body to produce a reaction of the adaptive immune system. Contact of the immune system to antigens results in the production of highly specific (antigen specific) antibodies.

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CD4 Proteins & Antigen presenting cells

If Helper T-Cells express CD4+ proteins on their surface to bind to MHC Class ll proteins on antigen presenting cells, why do antigen presenting cells also have CD4+ Proteins?
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What is meant by 'fixing' of an antigen presenting cell?

Can someone please explain what does 'fixing' of an antigen presenting cell mean?
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Do allergens have structural similarities to pathogens?

The conventional popular explanation of allergies is that the immune system confuses allergens with pathogens and reacts to them as such. Is there any merit to this explanation? If so, I would ...
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O-Group names of Salmonella serotypes?

What liposaccharides are represented by the O-group designations of Salmonalla serovars in the Kauffman-White classification scheme? I mean to ask, how do the numbers in a Sal serovar (1, 9, & 12 ...
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Are antibodies and hepatitis viruses of similar adaptability?

Antibodies and Hepatitis viruses both have hypervariable regions. Is one more adaptable than the other? Precisely how adaptable are they? I have read that antibodies can be trained to bind to ...