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. 2020 Jul 20;48(15):8490–8508. doi: 10.1093/nar/gkaa597

Figure 7.

Figure 7.

Model for pol IV extending D loops. Double-strand breaks are processed by the RecBCD helicase-nuclease multiprotein complex. RecBCD resects breaks and loads RecA on the single-stranded DNA regions, forming RecA* filaments. RecA* filaments are competent to induce the SOS response while undergoing homology search. Once a homologous sequence is found in the genome, a D loop can form which can be extended by certain DNA polymerases. Pol IV, for instance, can participate in recombination reactions following RecBCD activity.