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"There are organs known as 'kidneys,' [...] One on either side of the lower back, just above the hips. A strike there causes considerable anguish, often so severe that the victim is unable to cry out."
Nom Anor to Shimrra Jamaane[1]

Kidneys or nephri[2] were organs located near the lower back on Humans.[1] Although naturally having both a left and right kidney,[3] Humans were able to survive with only one kidney.[1] Kidneys could be transplanted[4] and even cloned if that was needed.[5]

Diffrent species can have a diffrent number of kidneys. For example members of the Yarkora species have four kidneys. Exogorths had ten nephri.[2]

Hitting a person in the kidneys caused extreme—often disabling—pain for the victim.[1] Older Humans often suffered from Zithrom's syndrome, which resulted in shrunken kidneys, among other symptoms.[6]

Kidney stones could accumulate within the kidneys and be passed from the body.[7]

Yuuzhan Vong typically lacked kidneys.

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