CLEC4M and infection: As seen in Fig. 1c, inoculation of CHO-ctrl, Lec2-DC-SIGN and Lec2-L-SIGN with BJx109 (with no NH4Cl added = mock) resulted in 60–80% infection 8 hr post-exposure whereas addition of NH4Cl immediately after addition of virus (t = 0 hr) reduced infection levels to <1%.