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Controlling the valency of immuno-QDs. (A) Schematic illustration of the antibody conjugation process through the BB domain (red) of the capping fusion protein. (B) Agarose gel analysis of immuno-complex formation at various IgG to QD ratios. The gels were stained with Coomassie blue (top images) or photographed under UV light (bottom). The migration position of unconjugated QDs and IgG are indicated, as is the position of two different immuno-conjugates (a and b).
