The s (epsilon)Proteobacteria Scattered 。Helicobacter rickettsias Chicken embryo cell ·Multiple flagella Nucleus 。Peptic ulcers ·Stomach cancer Masses of rickettsia in nucleus (b)Rickettsias in chicken embryo cell Figure 11.1b • Helicobacter • Multiple flagella • Peptic ulcers • Stomach cancer The  (epsilon) Proteobacteria Figure 11.1b