The spools from which DNA unwinds are called histones.

Here's a breakdown:

* DNA is a long, thin molecule that contains our genetic code.

* Histones are proteins that help organize and package DNA into a more compact structure called chromatin.

* Chromatin is like thread wrapped around a spool. The DNA is the thread and the histones are the spools.

* This packaging is crucial for fitting all of our DNA into the nucleus of a cell.

Let me know if you have any more questions!