Antigens are molecules that can trigger an immune response in the body. While some antigens may come from pathogens such as bacteria, viruses, or other harmful substances, not all antigens are pathogens. Antigens can also come from harmless substances like pollen, dust, or certain foods. **

Antigens are molecules or substances that are recognized by the immune system as foreign and can elicit an immune response. They can be found on the surface of pathogens such as bacteria, viruses, and parasites, as well as on the surface of transplanted tissues or cells. Antigens are also present on the surface of cancer cells. When the immune system detects antigens, it produces specific antibodies or activates immune cells to target and eliminate the foreign substances. **

Antigens are produced by a variety of cells in the body, including B cells, T cells, macrophages, dendritic cells, and other antigen-presenting cells. These cells play a crucial role in the immune response by presenting antigens to the immune system and activating immune responses against foreign invaders. **

Antigens are molecules that can trigger an immune response in the body. They are usually proteins or polysaccharides found on the surface of pathogens such as bacteria, viruses, or other foreign substances. When the immune system detects antigens, it produces antibodies to neutralize or eliminate the threat. Antigens can also be found on the surface of normal body cells, and in this case, the immune system must distinguish between self and non-self antigens to avoid attacking healthy tissues. **

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Antigens can enter the body through various routes such as inhalation, ingestion, injection, or direct contact with the skin. When inhaled, antigens can enter through the respiratory system, while ingested antigens can enter through the digestive system. Injection of antigens can occur through a puncture wound or through medical procedures like vaccinations. Direct contact with the skin allows antigens to enter through cuts, scrapes, or mucous membranes. **