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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/).
DPPH inhibition (%) of sea urchin crude extracts (n = 9) and isolated spinochromes (n = 6). Data are expressed as the means ± one standard deviation of n independent experiments for each concentration of a sample.