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.
On March 24th, 2015. See this statement in context.