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MT activity in mixed lysates is titratable. (A) MT growth profiles for mixed lysates. The 1:3 S:G1 lysate lacks any MT activity. (B) Growth rates of MTs in mixed lysates compared with wild-type lysates arrested in S phase. (C) MT shrinkage rates in S phase-arrested and mixed lysates. None are statistically different from the others, with the exception of the 1:3 S:G1 lysate. MT counts for each condition were 9:1=30, 3:1=25, 1:1=30. **P<0.01, ***P<0.001 and ****P<0.0001.
