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Crystal balls: Colloidal crystal microbeads with a three-dimensional photonic crystal structure can be fabricated with a droplet generator and their reflection spectra used as encoding elements. A multiplex bioassay demonstrates their reliability as encoded carriers (see picture: red, green, and blue beads are immobilized with human, mouse, and rabbit immunoglobulin, respectively).
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Zhao et al. (2006) studied this question.
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