D2I2.
genetic

Cystinuria

Cystinuria is an inherited disease characterized by high concentrations of the acid cystine in the urine, leading to the formation of cystine stones in the kidneys, ureters, and . It is a type of . "Cystine", not "cysteine," is implicated in this disease; the former is a dimer of the latter.

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Plain-language summary adapted from Wikipedia. Not medical advice.