Bacteriophage<unk>  or<unk> <unk>  is a bacteriophage, a type of virus that infects bacteria.  It uses DNA-based transposition to integrate its genome into the genome of the host cell that it is infecting.  It can then use transposition to initiate its viral DNA replication.  Once the viral DNA is inserted into the bacteria, the<unk>  transposase protein/enzyme in the cell recognises the recombination sites at the ends of the viral DNA and binds to them, allowing the process of replicating the viral DNA or embedding it into the host genome.
Mu phage
Transfer RNA
Vector 
Vector
Adeno-associated virus
Helper virus
HACEK organism
Helper dependent virus