plasmid pstp21 has been used as a receptor plasmid to clone a variety of mutant and wild-type trp operons by reca-dependent in vivo recombination between the insert dna of the plasmid and the homologous trp flanking sequences of transducing dna fragments transferred into the cell by bacteriophage p22 .
C1419240
reca
C0034865
recombination