On a sort of a pure chance basis, given that four of these bases are used by the body to make the code and to use the code, you would expect that in 3 billion base pairs you would find one in roughly every 250 lengths. That means there's a possibility of interacting at any point in the DNA chain, and since any point may come at a particular size of loop.... In other words, you may get a CTCT at the very end, with a little piece of chain sticking out. You can get a reaction there, but you can also get one where you have a loop and a coiled coil, which represents a larger one, more like the big ring on the old TV antenna. The DNA has electrons that can respond and do respond to electric fields.
