intact: the oriT region displays the full activity of ssDNA transfer origin, including the nic site and all the inverted repeats (IRs) that bind the proteins involved in DNA transfer.
core: the oriT core region consists of the nic site and one pair of IR located near nic
(indispensable for origin of ssDNA transfer, but not displaying the full activity).
incomplete: only conserved nick region, or only IRs