Animal Cell Culture and Regulation
Toxicity due to accumulation of ammonia can be overcome

All of these
by substituting glutamine by glutamate
by removal of ammonia or ammonium from culture medium
by controlled addition of glutamine at low level

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Animal Cell Culture and Regulation
An established cell line can be called where it has been subcultured at least

70 times at an interval of 3 days between subcultures
50 times at an interval of 3 days between subcultures
40 times at an interval of 3 days between subcultures
70 times at an interval of 1 day between subcultures

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