the.com/antigen
the molecular mugshot your immune system memorizes so it can hunt you down later
means Any molecule—often a protein or sugar on the surface of a microbe, cell, or foreign substance—that your immune system recognizes as a target and responds to, typically by making antibodies against it.
from A modern scientific blend, stitched together around the turn of the 20th century from 'antibody' plus the Greek '-gen,' meaning 'producer' or 'that which generates' (the same '-gen' lurking in oxygen and hydrogen). So an antigen is literally an 'antibody-generator'—the thing that provokes the defensive response, named for what it makes your body do.
- name origin
- Short for antibody-generator, the thing that provokes defense
- self-betrayal
- Your own cells can become antigens in autoimmune disease
- blood types
- A and B blood groups are just sugar antigens
- shape obsessed
- Recognized by tiny epitope patches, not the whole molecule
- vaccine bait
- Vaccines show antigens without the actual dangerous pathogen
covid-19 spike protein — viral protein that triggered immune response in billions of vaccinated people worldwide since 2021
pollen from ragweed — allergen that affects 26 million americans annually causing seasonal allergies
blood type a antigen — carbohydrate on red blood cells determining abo blood group compatibility for transfusions