What discovery suggested the presence of other DNA polymerases in bacteria besides the Kornberg DNA polymerase enzyme?

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The fact that mutants with less than 1% of the normal Kornberg DNA polymerase enzyme activity were able to multiply at a normal rate suggested that there were other DNA polymerases present in bacteria besides the Kornberg DNA polymerase enzyme. If there were only one DNA polymerase enzyme in bacteria, then these mutants would not have been able to replicate their DNA effectively and would have grown much more slowly or died. The ability of the mutants to reproduce at a normal rate indicated that they were using alternative DNA polymerases to replicate their DNA.

What Discovery Suggested the Presence of Other DNA Polymerases in Bacteria