Inhibition of entry of ScFv/RVG conjugate into nAchR-overexpressing 293 cells and neuroscreen cells by irradiated rabies virus and α-bungarotoxin. Flow cytometry on nAchR-overexpressing 293 cells pre-treated with irradiated rabies virus (A, B) and α-bungarotoxin (C, D) before incubation with ScFv (A and C), and ScFv/RVG conjugate (B and D). Flow cytometry on neuronal 2a cells pre-treated with irradiated rabies virus (E, F) and α-bungarotoxin (G, H) before incubation with ScFv (E and G) and ScFv/RVG conjugate (F and H). Solid line: no inhibitor, Dotted line: pre-treated with irradiated rabies virus or α-bungarotoxin; A representative result from triplicate experiments is shown.