Match the column - I with column – II.
| Column – I | |
| Column – II | |
| A. Polymerase chain reaction | 1. Monoclonal antibody production |
| B. Tumour inducing plasmid | 2. Breaking bond between insulin and galactosidase |
| C. Bromine cyanide | 3. Introducing foreign genes into plants |
| D. Hybridoma technology | 4. Gene amplification |
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