The region in the nucleus that produces tiny cell particles needed for protein synthesis is called the nucleolus.

Here's a breakdown:

* Nucleolus: This is a dense, spherical structure found within the nucleus of eukaryotic cells. It's not membrane-bound, but rather a region of concentrated ribosomal RNA (rRNA) and proteins.

* Ribosomal RNA (rRNA): This type of RNA is a key component of ribosomes.

* Ribosomes: These are cellular structures responsible for protein synthesis. They read the genetic code in messenger RNA (mRNA) and use it to assemble amino acids into proteins.

How the Nucleolus Works:

1. rRNA synthesis: The nucleolus contains the genes for rRNA. It produces rRNA molecules, which then combine with proteins to form ribosomal subunits.

2. Ribosome assembly: These subunits are transported out of the nucleus into the cytoplasm, where they combine to form complete ribosomes.

In summary: The nucleolus is the central hub for ribosome production, which are essential for protein synthesis.