Mirror Image Twins

I've recently finished and sent in for consideration a story where the hero is a mirror image twin. The mirror image twin occurs in about 25% of the twin cases. They are identical twins, where the DNA is the same, but there may be some small differences, such as left handed and right handedness. This occurs because the split in the fertilized egg came late, usually about nine to twelve days.
The reason I became interested in this was because I once saw someone who looked so much like someone I knew I could hardly believe it was not the same person. However, it was not the same person and in the back of my mind I thought they must have been twins. This sparked an idea for a story and so I began to put it together. Ideas are all around us and now I have another one I'm working on. Have to get busy.