Here's a breakdown:

* DNA in the nucleus contains the genetic code for making proteins.

* This code is transcribed into messenger RNA (mRNA).

* The mRNA travels out of the nucleus and attaches to ribosomes, which are found in the cytoplasm.

* Ribosomes read the mRNA code and use it to assemble amino acids into protein chains.

So, while the instructions for making proteins come from the nucleus, the actual protein synthesis takes place in the ribosomes.