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ImUnique1820 ImUnique1820
wrote...
Posts: 600
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6 years ago
The natural killer cells that circulate the body:
 
  a. are present in infants and children, but disappear by middle age
  b. engulf teratogens and viruses and devour them
  c. push infected cells through the body to the spleen
  d. inject diseased cells by injecting them with toxic chemicals
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