Phosphate-Buffered Saline is a buffer solution used in biological research. It is a water-based salt solution which contains disodium hydrogen phosphate, sodium chloride and, in some formulations, potassium chloride and potassium dihydrogen phosphate. This has many uses because of its isotonic property and non-toxic to most cells. Its uses include substance dilution and cell container rinsing and the main function of this buffer is to help maintain a constant pH in a solution.
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