Match the scientists in column I with their respective discoveries in column II.
| Column I | |
| Column II | |
| P. Arber, Smith and Nathans | 1. Restriction enzymes |
| Q. Sir Alec Jeffreys | 2. Polymerase chain reaction |
| R. Kary Mullis | 3. DNA fingerprinting |
| S. G. Kohler and C. Milstein | 4. Hybridoma technology |
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