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. 2015 Oct 13;3:e1305. doi: 10.7717/peerj.1305

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© 2015 Pintus et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Absorption spectra of EEL in presence of various concentration of copper ions. Arrows indicate the decrease in absorbance at 265 nm and the contemporary increase in absorbance at 325 nm, after CuSO₄ addition. Inset: increase of absorbance at 325 nm vs CuSO₄ concentation.