when reca protein was preincubated with single-stranded dna in the presence of an atp-regenerating system prior to the addition of homologous duplex dna , a slow presynaptic step was eliminated , and the subsequent homologous pairing was revealed as a reaction whose rate exceeds by 1 or 2 orders of magnitude the calculated rate of spontaneous renaturation in 0.15 m nacl at tm -25 degrees c .
C0012935
single-stranded dna
C0012854
dna