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This work was done in the European plum (Prunus domestica). The gene for PPV coat protein was separated from the PPV virus and inserted into the plum DNA, which was then regenerated and grown into complete plum trees. These trees now had the additional gene in their DNA and became resistant to PPV.
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Ionic crystals are hard because of tight packing lattices, say, the positive and negative ions are strongly attached among themselves.
