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Alkaptonuria (AKU) is an ultra‐rare disease caused by the deficient activity of homogentisate 1,2‐dioxygenase enzyme, leading the accumulation of homogentisic acid (HGA) in connective tissues implicating the formation of a black pigmentation called “ochronosis.” Although AKU is a multisystemic disease, the most affected tissue is the articular cartilage, which during the pathology appears to be highly...
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