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Esophageal gland of the scaly snail. (A) Cross section through the entire snail, showing the large esophageal gland (gl). Bar, 0.5 cm. (B) Transmission electron micrograph of bacterial cells within the esophageal gland of the scaly snail. The symbionts (arrows) appear to occur within bacteriocytes. cm, cell membrane; n, nucleus. Bar, 2 μm. (C) Single bacterial cell. Bar, 0.5 μm.
