One point mutation

Emir em at
Wed Jun 10 20:12:47 EST 1998

Dear colleagues,
I heard that to get UV mutants of bacteria with only one point mutation one
should take only those UV-exposed plates, which have 50% of survived clones
(as compared to non-irradiated control plates). Could someone give an
explanation to this? Is it possible to have a published reference?
Thank you in advance.

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