escherichia coli reca protein makes joint molecules from single-stranded circular phage dna ( viral or plus strand ) and homologous linear duplex dna by a polar reaction that displaces the 5 ' end of the plus strand from the duplex molecule [ kahn , r. , cunningham , r. p. , dasgupta , c. & radding , c. m. ( 1981 ) proc . natl . acad . sci . usa 78 , 4786-4790 ] .
C0012935
single-stranded
C0012854
dna