So we can't actually fit the DNA in the way that we have it now into the nucleus of cells. For example, in humans, if we take a human DNA and we stretch it out, it's going to be somewhere between five and 6ft in length, and that's clearly too large to fit it into a tiny, tiny microscopic nucleus of any of our somatic cells. So the way that organisms solve this problem is by creating something called the chromosome. So they take these special proteins and they take the DNA and they wrap the DNA around the proteins many, many times. So they create coils, and then super coils, and then solenoids and more coils, and eventually they form this extremely condensed and dense version of the DNA we call a chromosome. So, if this is our protein and this is our DNA, we basically take the DNA and we wrap the DNA around the protein many, many, many times.