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Neat gin? Surprisingly, it can stimulate an immune response (7)

Ross

I believe the answer is:

antigen

'it can stimulate an immune response' is the definition.
(antigens cause a response from the immune system)

'neat gin? surprisingly' is the wordplay.
'surprisingly' indicates anagramming the letters.
'neat'+'gin'='neatgin'
'neatgin' is an anagram of 'ANTIGEN'.

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

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