(B) Left: Merged fluorescence images showing sporozoites on cultured HFF cells. Actin filaments of HFF cells were stained with phalloidin (shown in red), nuclei were stained with Hoechst (blue) and sporozoites expressed GFP (green). Scale bar, 50 µm. Right: Maximum projection of sporozoites moving for 3 min on cultured HFF cells. Scale bar, 50 µm. 