The conversion of DNA-damage induced single-stranded gaps into large molecular weight DNA via processes such as template switching, which does not remove the replication-blocking lesions but does not increase the endogenous mutation rate.
Source:PMID:11459630,
GOC:jl,
GOC:elh
Comment
Note that 'error-free' does not mean that literally zero errors occur during DNA synthesis, but that the error rate is low, comparable to that of DNA synthesis during replication.