What causes immunodeficiency?

  • A
    Enteric fever
  • B
    Defective thymus gland
  • C
    $AIDS$ virus
  • D
    Defective bone

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Small proteins produced by vertebrate cells in response to viral infection,which inhibit further viral multiplication,are known as.............

Helper $T$-cells : Lymphokines :: Killer $T$-cells : . . . . . . .

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