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FISH of an adult esophageal bulb. (A) Whole mount of an adult esophageal bulb labeled with EdF1-Cy5, specific to “Ca. Erwinia dacicola.” Bar, 20 μm. (B) Higher magnification of “Ca. Erwinia dacicola” cells found within the esophageal bulb and labeled with EdF1-Cy5. Bar, 2 μm.