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Host cell reactivation of ultraviolet-irradiated phage can be used as a probe of the bacterial repair system and to determine phage and cellular contributions to the repair process. Using the Bacillus subtilis phages SPP1, SP01, phie, and phi29, we found that the uvr-1 and polA functions are involved in the host cell reactivation of the four phages. SPP1 was the only phage whose reactivation was also decreased in recA, recD, and recF mutant cells. We studied variations of host cell reactivation for SPP1 during spore outgrowth; at high ultraviolet doses the activity of a spore repair system requiring deoxyribonucleic acid polymerase I became evident. The spore repair system was completely replaced by the vegetative one by 120 min of outgrowth.
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