Abstract
Forty-six cell cultures established from amniocentesis fluids were preserved in liquid nitrogen and later recovered from the frozen state with little loss of viability as compared to prefreeze viability. Five to 10% glycerol was found to be optimal for preservation in liquid nitrogen, and as few as 5×105 viable cells per frozen ampule could initiate cell growth. Storage in liquid nitrogen did not affect the genetic stability of glucose-6-phosphate dehydrogenase, lactate dehydrogenase, malic dehydrogenase, leucine aminopeptidase, acid phosphatase, or 6-phosphogluconic acid dehydrogenase isozymes of the amnion cultures.
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