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In page Surround optical-fiber immunoassay:

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SOFIA comprises a multiwell plate sample container, an automated means for successively transporting samples from the multiwell plate sample container to a transparent capillary contained within a sample holder, an excitation source in optical communication with the sample, wherein radiation from the excitation source is directed along the length of the capillary, and wherein the radiation induces a signal which is emitted from the sample, and, at least one linear array.[citation needed]