Are you aware of any components other than dextran sulfate which interfere with transfection?
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Maximizing Transient Protein Production
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It has been shown that lipids, including cholesterol, in the medium can significantly impact transfection efficiency. That’s why screening and selection of the basal growth medium is important to achieve good transfection efficiency. Besides chemical components, healthy, low passage cells are also critical for maximizing transfection results.