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Principle of quantitative immunochromatographic assay of CA 19-9. (a) Capture of gold nanoparticles on the test line and control line in the presence of CA 19-9. (b) Capture of gold nanoparticles on the control line in the absence of CA 19-9. (c) Measuring the intensities of test line and control line with a portable strip reader connected to a laptop computer.
