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Intracellular delivery of reporter genes causes cells to be luminescent or fluorescent, this condition being of tremendous relevance in applied physics research. Potential applications range from the study of spatial distribution and dynamics of plasma membrane and cytosolic proteins up to the rational design of nanocarriers for gene therapy. Since efficiency of gene delivery is the main limit in most biophysical studies, versatile methods that can maximize gene expression are urgently needed. Here, we describe a robust methodology based on repeated gene delivery in mammalian cells. We find this procedure to be much more efficient than the more traditional route of gene delivery making it possible to get high-quality data without affecting cell viability. Implications for biophysical investigations are discussed.

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