File:Female scientist samples DNA for a round in the thermocycler, as preparation for a polymerase chain reaction (PCR).jpg
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![File:Female scientist samples DNA for a round in the thermocycler, as preparation for a polymerase chain reaction (PCR).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Female_scientist_samples_DNA_for_a_round_in_the_thermocycler%2C_as_preparation_for_a_polymerase_chain_reaction_%28PCR%29.jpg/398px-Female_scientist_samples_DNA_for_a_round_in_the_thermocycler%2C_as_preparation_for_a_polymerase_chain_reaction_%28PCR%29.jpg?20080209000949)
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