Multiple choice

Natural killer cells are a type of lymphocyte and a component of innate immune system. Natural killer (NK) cells do not

  1. respond to interferon

  2. contain perforin

  3. contain tumor necrosis factor (TNF)

  4. kill only by damaging the target cell outer membrane

  5. contain serine proteases
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Perforin inserts into the target cell membrane, thereby facilitating entry of TNF and granzymes into the target cell.

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