________ is secreted by basophils that help in preventing blood clotting.

Explanation

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

1. **Identify the Cell Type**: Basophils are a type of white blood cell that play a role in the immune response.

2. **Function of Basophils**: Basophils are involved in fighting infections, particularly fungal and bacterial infections.

3. **Secretion by Basophils**: Basophils secrete a substance known as Heparin.

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