BCMA+ cells (COS-7-BCMA, U266, or H929) were incubated for indicated times with 200 nM aptamer in serum-free medium. After treatment, cells were washed DPBS or with DPBS 0.5 M NaCl in order remove not internalized aptamers. Binding was evaluated by qRT-PCR and the percentage of internalized aptamers on the total bound was calculated.
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