Figure 2.

HeLa cells labeled with the avidin-conjugated yellow-emitting QDs.[47]. (A) Image of cells immediately after the unbound QDs were removed in which labeling is restricted to the cell surface. (B) Image of a cell that was allowed to grow for 2 h after washing out of unbound QDs.

Valizadeh et al. Nanoscale Research Letters 2012 7:480   doi:10.1186/1556-276X-7-480
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