Trypan Blue Solution, 0.4%, is routinely used as a cell stain to assess cell viability using the dye exclusion test. The dye exclusion test is used to determine the number of viable cells present in a cell suspension. It is based upon the concept that viable cells do not take up impermeable dyes (like Trypan Blue), but dead cells are permeable and take up the dye.
In this test, a cell suspension is simply mixed with dye and then visually examined to determine whether cells take up or exclude dye.
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