Immune system component

This time we are looking on the crossword clue for: Immune system component.
it’s A 23 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: TCELL.

Last seen on: –NY Times Crossword 7 Nov 21, Sunday
LA Times Crossword 25 Apr 21, Sunday
-NY Times Crossword 3 Dec 2017, Sunday
-The Washington Post Crossword – November 3 2017