The oval-shaped bodies found inside the nucleus of most cells are called nucleoli.

Here's a bit more about them:

* Function: Nucleoli are responsible for producing ribosomes, which are essential for protein synthesis.

* Composition: They are primarily made up of RNA and proteins.

* Appearance: They appear as dense, dark-staining regions within the nucleus, often seen as one or two prominent structures.

* Dynamic: Nucleoli are not static structures; they can change in size and number depending on the cell's activity level and needs.

Let me know if you have any other questions about cell biology!