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A vial holds 1 million cells and 20 per cent are lost on thawing. How many viable cells are recovered?

  • A.200,000
  • B.980,000
  • C.500,000
  • D.800,000

Answer: D

Losing a fifth leaves four fifths, which is 800,000. Some loss on thawing is normal, which is why vials are frozen at a higher density than the experiment strictly requires. Counting after thawing rather than before avoids an unpleasant surprise.

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