appropriate mixtures of oligonucleotides generated three specific branched duplex dna molecules : ( i ) a holliday junction analog having a fixed ( immobile ) crossover bounded by four duplex dna branches , ( ii ) a similar holliday junction analog which is capable of limited branch migration and , ( iii ) a y-junction , with three duplex branches and fixed branch point .
C0012854
dna
C1258072
holliday junction