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. 2015 Jul 23;12(8):8678–8690. doi: 10.3390/ijerph120808678

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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(a) Appearance of fresh-cut lettuce after combined processing (V + PAA) and detail of the lettuce tissue structure (b) Appearance of fresh-cut lettuce after combined processing (P + CW) and detail of the lettuce tissue structure.