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The life of the cell is usually described as a recurrent sequence of biochemical events, e.g., the life cycle, the cell cycle, or the division cycle. Since cell division is the end of one life sequence, it would also be the beginning of the next one if the sequences recur consecutively. In this report, we suggest that the life sequence is a linear progression of events which is not necessarily inaugurated at division nor necessarily recurrent. It consists of three steps:
Helmstetter et al. (Mon,) studied this question.