ColE1

ColE1 is a high copy replicon source: http://books.google.com/books?id=1qCum7pWOFwC&pg=PA222&lpg=PA222&dq=why+do+phagemids+have+a+cole1+ori&source=bl&ots=mpmdFZN1Y1&sig=Mrd3oTYkdIIcr5Ff-5BjOiYLts8&hl=en&sa=X&ei=2uYFT6bJN8KaiALPuuGCDA&ved=0CDkQ6AEwBA#v=onepage&q=why%20do%20phagemids%20have%20a%20cole1%20ori&f=false