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Unconjugated bilirubin and haemin (both Frontier Scientific Europe, Carnforth, Lancashire, UK) served as external standards

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Sources and references Vitamin B2 (Riboflavin) - StatPearls - NCBI Bookshelf Historical Aspects of Propolis Research in Modern Times - PMC The Effect of Hydration on Urine Color Objectively Evaluated in CIE L*a*b* Color Space Changes In Urine: Causes, Symptoms & Treatment Analysis of the Distribution of Urine Color and Its Relationship With Urine Dry Chemical Parameters Among College Students in Beijing, China A Cross-Sectional Study - PMC Author Stephanie Wright Stephanie brings over 13 years of diverse nursing experience to the table, having honed her expertise in critical care, mental health, and utilization management