Fig. 6. Parasite calcium responses during gliding and invasion. (A) Frame-by-frame quantification of calcium changes in a parasite gliding on serum-coated glass. The parameters monitored for data in Table 1 are indicated. (B) Frame-by-frame analysis of calcium changes in a parasite during host cell invasion. Arrows indicate first contact with the host cell (contact), as well as when the parasite is fully inside the host cell (intracellular). Background is indicated by the dashed line.