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Spacer diversity versus location when the probability of deleting spacer i is proportional to i. a) When the number of spacers in the CRISPR array is over 30, one spacer is selected to be deleted with a possibility proportional to its distance to the leader proximal end. b) When the number of spacers in the CRISPR array is over 30, one spacer at a random location is deleted. The parameters are the same as in Fig. 6.
