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A scan of Susanna Leijten's upper chest showing the thymus

The thymus was a gland located in the upper chest of a Human body. It played an important role in the Human immune system.

The parasitic Tarchannen III species cells were located in the thymus after infecting a host, using the immune system to spread genetic instructions that would turn the host into a full member of the species.

Doctor Beverly Crusher successfully removed the parasite from Susanna Leijten's and Geordi La Forge's thymuses after they were infected by the lifeform. (TNG: "Identity Crisis")

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