Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme? How is it activated?

Explanation

**Step-by-Step Solution:**

1. **Identify the Enzyme and Its Inactive Form:**
- Trypsinogen is the inactive form of the enzyme trypsin, which is secreted by the pancreas as part of pancreatic juice.

2. **Identify the Activating Enzyme:**
- The enzyme that activates trypsinogen is called enterokinase.

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