How DNA got into the bacteriophage

How the DNA got into the killer machine In a bacterium infected by T4, new bacteriophages are assembled in a stepwise process: the shaft builds up, DNA is replicated and the empty pro-head assembles as an empty shell. But how does the DNA get into the prohead? The initiation of DNA import is not entirely clear, but once DNA, the packaging motor and pro-head interact the DNA is rapidly threaded through a pore in the circular motor at the speed of 2000 basepairs a second. Once the head is full, the packaging