"Immune response trigger" NYT crossword answer is:ANTIGEN (7 letters length)
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The immune response trigger crossword clue in the New York Times (December 27 2023) is "ANTIGEN". An antigen is a molecule that is recognized by the immune system and triggers an immune response. Antigens can be proteins, carbohydrates, lipids, or nucleic acids, and they are usually found on the surface of bacteria, viruses, and other foreign substances. The immune system recognizes the antigen and produces antibodies to fight it off.