Give the exact location and function of passage cells.

Explanation

**Step-by-Step Solution:**

1. **Identify the Location of Passage Cells:**
- Passage cells are located in the endodermis of the roots of flowering plants.
- Specifically, they are found in the region of the endodermis that is opposite to the protoxylem.

2. **Describe the Characteristics of Passage Cells:**
- These cells are characterized by their thin walls, which differentiate them from other cells in the endodermis.
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