_______ is also referred to as ribosome factory.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for a term that is referred to as the "ribosome factory." This indicates that we are looking for a specific part of the cell involved in the production of ribosomes.

2. **Identifying the Structure**: In eukaryotic cells, the structure responsible for the assembly of ribosomes is known as the nucleolus.

3. **Location of the Nucleolus**: The nucleolus is located within the nucleus of eukaryotic cells.

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