Proteins separated on sodium dodecyl sulphate-polyacrylamide gels can be detected in subpicogram quantities by radioactivation of silver-treated protein molecules.
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Wallace, A., Saluz, H. Beyond silver staining. Nature 357, 608–609 (1992). https://doi.org/10.1038/357608a0
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DOI: https://doi.org/10.1038/357608a0
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