In one article, I found that they used  (PBS/4% formol) for fixation step instead of trichloroacetic acid(TCA), and Sodium dodecyl sulfate (SDS) instead of Tris base to solubilize protein bound Sulforhodamine, I didn't find any protocol that suggest these modifications, Can anyone explain why they made this changes?

They work on T24 bladder cancer cell line

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