If you're doing kinase activity assays the old fashion way with radioactive labelled ATP and peptide substrate you might use P81 cation exchange chromatography paper to capture the peptide. Whatman, now GE Healtcare has stopped the production and I can't find anywhere to buy this P81 paper anymore. I figure that if everybody who is in need of this product contacts GE Healthcare and ask them to start production again, we might get them to do it. So please help.

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