Match the following:
| Column I | Column II |
| P. Edward Jenner | 1. Phagocytosis |
| Q. Elie Metchnikoff | 2. Smallpox vaccine |
| R. Wiener and Landsteiner | 3. Hybridomas |
| S. Milstein, Kohler and Jerne | 4. Rh factor |
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