Name two cellular structures which have no limiting membrane.

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for two cellular structures that do not have a limiting membrane. A limiting membrane typically refers to a lipid bilayer that encloses a cellular structure.

2. **Identifying Cellular Structures**: We need to think of cellular structures that exist without being enclosed by a membrane.

3. **First Structure - Nucleolus**:
- The nucleolus is a prominent structure found within the nucleus of eukaryotic cells.
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