The structure found in the nucleus that is made of DNA is called chromatin.

Here's a breakdown:

* DNA: Deoxyribonucleic acid, the genetic material that contains instructions for building and maintaining an organism.

* Chromatin: A complex of DNA and proteins that makes up chromosomes. It's essentially DNA packaged and organized with proteins to fit inside the nucleus.

* Chromosomes: Tightly coiled and condensed structures of chromatin that are visible during cell division.

So, while DNA is the underlying material, it's organized into chromatin within the nucleus.