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Life span analysis. The analysis was performed on NOY408-1b (white box), NOY408-1bf (white circle), and TAK300 (filled circle) as described previously (Kennedy et al. 1994). Life span was determined by scoring the number of daughter cells produced by each mother cell before cessation of all division. The average life spans were as follows: NOY408-1b = 18; NOY408-1bf = 28; TAK300 = 22.
