
1) Bug fighters 2) Foreign instigators 3) Immunity providers 4) Toxins
Found on
https://www.crosswordclues.com/clue/antigens

proteins, usually foreign, which cause the bodies defense system to produce an antibody. Antigens may be food proteins, bacteria ,viruses or protozoa or cells from another individual(transplant).
Found on
http://www.encyclo.co.uk/local/20169

Substances which are capable, under appropriate conditions, of inducing a specific immune response and of reacting with the products of that response, that is, with specific antibodies or specifically sensitised T-lymphocytes, or both. Antigens may be soluble substances, such as toxins and foreign proteins, or particulates, such as bacteria and tis...
Found on
http://www.encyclo.co.uk/local/20973

Substances that cause the immune system to make a specific immune response. An example would be a protein only found on tumor cells. Another example would be a murine antibody, which is derived solely from mouse proteins and therefore is viewed as foreign by the host (human) body.
Found on
http://www.encyclo.co.uk/local/22237

Substances (especially proteins) that are introduced or gain entrance into the blood and that stimulate the immune system to produce antibodies (or, in insects, other protective, lytic, or cidal substances), which react with and render the antigen ineffective.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

(Humans as organisms) foreign invaders in the body that trigger an immune response
Found on
http://www.encyclo.co.uk/visitor-contributions.php

(Learning Modules / Geography / Geography of health) An antigen on a virus surface causes production of antibodies.
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http://www.encyclo.co.uk/visitor-contributions.php

Proteins found on the surface of pathogens such as viruses and bacteria. Antigens are unique to each pathogen. The body recognises an antigen on the SARS-CoV-2 virus as foreign and this stimulates an immune response.
Found on
https://post.parliament.uk/covid-19-glossary/

Substances that can stimulate an immune response. Antigens are usually proteins or polysaccharides and include the coats, capsules, cell walls, flagella, fimbrae, and toxins of parasites, bacteria, viruses, and other microorganisms.
Found on
https://www.cdc.gov/parasites/glossary.html

Foreign substances (e.g. bacteria or viruses) in the body that are capable of causing disease. The presence of antigens in the body triggers an immune response, usually the production of antibodies.
Found on
https://www.cdc.gov/vaccines/terms/glossary.html

Molecules carried or produced by microorganisms that initiate antibody production; mostly proteins or proteins combined with polysaccharides.
Found on
https://www.encyclo.co.uk/local/21571

An antigen is a foreign substance (such as a virus or bacteria) that invades the body. When the body detects it, it produces specific antibodies to fight off the antigen.
Found on
https://www.endocrineweb.com/conditions/diabetes/diabetes-glossary

Foreign substances (e.g. bacteria or viruses) in the body that are capable of causing disease. The presence of antigens in the body triggers an immune response, usually the production of antibodies.
Found on
https://www.futurelearn.com/info/courses/the-role-of-vaccines-in-preventing

foreign substances in the body that are capable of causing disease. The presence of antigens in the body triggers an immune response, usually the production of antibodies. Antigens may be soluble substances, such as toxins and foreign proteins, or particulate, such as bacteria and tissue cells; however only the portion of the protein of polysacchar...
Found on
https://www.malariavaccine.org/glossary

Molecules that hang around pathogens which trigger an immune response from your body causing it to produce antibodies.
Found on
https://www.unicef.org.au/blog/resources/vaccine-glossary

Substances that cause an immune response in the body, identifying substances or markers on cells; the body produces antibodies to fight antigens, or harmful substances, and tries to eliminate them.
Found on
https://www.webmd.com/diabetes/guide/diabetes-glossary-terms
No exact match found.