Q.

With regard to natural killer lymphocytes

A. constitute less than 5% of blood lymphocytes
B. require opsonisation to enable their killing of cells
C. have a prime role in defense against parasites
D. require prior sensitisation to be effective
E. have an innate ability to lyse tumour cells and virally affected cells
Answer» E. have an innate ability to lyse tumour cells and virally affected cells
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