Crossword Genius

Immune response trigger (7)

Ross

I believe the answer is:

antigen

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">immune response trigger</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for antigen that I've seen before include "Immunity-booster" , "Substance inducing an immune response" , "Something inducing an immune response, neat gin (anag.)" , "Biological substance" , "It stimulates immune responses - tag nine (anag)" .)

I've seen this clue in the LA Times and The New York Times.
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