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. 2017 Aug 16;15(8):255. doi: 10.3390/md15080255

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© 2017 by the authors.

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/).

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Electrospray ionization-mass spectrometry (ESI-MS) of S-pyridylethylated HRL40-1 in the presence of a reducing agent. HRL40-1 (6 µg) was subjected to reduction and alkylation in the presence of 0.11 M tri-n-butylphosphine.