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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Concentration-dependent inhibitory effects of compound 1c and kojic acid on the activity of tyrosinase for l-tyrosine (A) and l-DOPA (B) as substrates at 25 °C. The error bar indicates the standard error of the mean (SEM) of triplicate experiments.