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Binding of ZZ-DTR to Vero cells. ZZ and ZZ-DTR were incubated overnight at 4°C with MAb-FITC. The complexes were subsequently incubated for 30 min at 4°C, and binding to Vero cells was assessed by using a FACScan system. Curves: 1, Vero cells alone; 2, ZZ/MAb-FITC; 3, MAb-FITC; 4, ZZ-DTR/MAb-FITC.
