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In page Electroporation:

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The success of electroporation depends on several factors, including the purity of the plasmid DNA solution,[5] salt concentration, and electroporation parameters.[citation needed] High salt concentrations can lead to arcing (electrical discharge), significantly reducing the viability of electroporated cells. Therefore, the electroporation conditions must be optimized for each cell type to achieve an effective balance between cell viability and DNA uptake.[6]