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Cellular uptake of (a) the polyelectrolyte/BSA complexes (WR 1) and BSA and (b) the polyelectrolyte/LYZ complexes (WR 1) and LYZ at various protein concentrations (5–50 ìg/mL) into MCF 7 cells. The 5×105 cells for BSA delivery or 1×105 cells for LYZ delivery were initially seeded in each well of a 6-well plate and were exposed to the polyelectrolytes and the complexes for 4 hr. The proteins used were labeled with RITC.
