A natural killer cell recognizes cancer cells by

Options :
  1. their location
  2. their accelerated growth rate
  3. their altered cell surface proteins
  4. all the above
Answer and Explanation :-

Answer: Option 3

Explanation:

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Memory isn't the defective tape recording you've been led to believe. It's the tape player itself, playing back the tracks of music we select-and sometimes those we don't.
-James P. Kimmel The Trial of Fallen Angels