So this is the double stranded DNA molecule that describes the interest, that describes the gene that we're studying. So what a restriction map is? It's basically a description of all the different locations found on this gene where our restriction enzymes can bind to and cleave that gene. So for example, let's suppose this gene has three different restriction sites. So here, here and here. And what that means is a type of restriction enzyme can bind onto these three locations and cleave that particular gene and those locations.