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Background: Since the postulation of uremic middle molecule (UMM) hypothesis made by Babb et al. [Trans-Am Soc Artif Intern Organs 18 (1972) 98], there has been great interest in the separation and identification of the role of UMM. However, few of the compounds isolated from UMM fractions were demonstrated to play an important role in humans. Thus, the separation and identification of the real UMM...
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