TABLE 3.

Recombinant formation in crosses between Hfr GM2807 (dam-16::Kan) and pMQ430/GM7323 (ΔruvABC::Cam Str^r)a

% Arabinose	Recombination frequency
None	5 (Cams UVr)
0.2	1,250 (Camr UVs)
0.02	4 (Cams UVr)
0.002	2 (Cams UVr)

^aBacteria were mated for 60 min and then plated for Kan^r Str^r recombinants on plates with various concentrations of arabinose. The numbers of recombinants in 50 μl of mating mixture are shown. The Cam^s UV^r recombinants arise from the transfer of the wild-type ruvA, -B, and -C genes from the donor.