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Adhesion of TOP10/pPcad-CdBD-GFP to cation exchange gel charged with Cd(II). After SP sepharose fast flow beads were precharged with Cd(II), recombinant bacterial cells were suspended with ddH2O, and mixed with the beads for the first fluorescent observation (up panel, ×400 magnification). After the addition of an equal volume of 100 mM Cd(II), the second fluorescent picture was captured (down panel, ×400 magnification).
