Choose the term that does not belong in the following groupings.
1. Redness, Pain, Swelling, Itching, Heat
2. Neutrophils, Macrophages, Phagocytes, Natural killer cells
3. Inflammatory chemicals, Histamine, Kinins, Interferon
4. Intact skin, intact mucosae, inflammation, First line of defense
5. Interferons, Antiviral, Antibacterial, Proteins