Fig. 3. (A) A macrostomal Tetrahymena vorax that has captured a latex bead with a diameter of 30 µm. The picture was taken 30 min after capture of the bead; there was no sign of phagocytosis of the latex bead. Scale bar, 20 µm. (B) A macrostomal cell Tetrahymena vorax that has phagocytosed a latex bead together with a T. thermophila cell. The picture was taken 10 min after adding T. thermophila cells and latex beads to the medium. Scale bar, 20 µm.