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RecA nucleoprotein filaments assembled on either ssDNA oligonucleotides or φX174 ssDNA promote DNA strand exchange in trans with the same efficiency. Presynaptic filaments were assembled on oligonucleotide #5 (12 μm, ▴) or φX174 ssDNA (12 μm, █). These filaments were used to mediate DNA strand exchange in trans between the mutually homologous DNA substrates: dsDNA (#43 and #72) and 32P-labeled ssDNA (#43).
