Fig. (6). Fluorescence imaging of ErbB2 over-expressing cells for their binding to ErbB2ECDpositive clones.
The figure shows binding of representative clones 113 and 150 to MCF-7/ErbB2 and SK-BR-3 cells, which are known to over-express the ErbB2 receptor. High intensities of fluorescence are seen in both MCF-7/ErbB2 and SK-BR-3 cells in comparison to minimally expressive MCF-7 cells. Negative controls of wild-type β-lactamase (Wt-BLA) and unselected library clones did not show higher fluorescence in MCF-7/ErbB2 and SK-BR-3 cells. The precipitating green fluorescence is produced by the β-lactamase activity associated with clones.