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Scheme of SMD‐IPTL. (A) The seven possible combinations of isotopically labeled acetylcysteine and acetylalanine. The atom marked with asterisk denotes 13C or 15N. (B) Work‐flow of sample preparation and labeling steps of SMD‐IPTL. (C) LC‐MS process for a mixture of 7‐plex labeled samples [Color figure can be viewed at wileyonlinelibrary.com]
