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. 2015 Jun 12;5:10044. doi: 10.1038/srep10044

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Copyright © 2015, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Principal component analysis of 3 typical aquatic ecosystems according to the percentage of annotated reads/tags in the SEED subsystems. The red star indicates the DW biofilm metagenome analysed in the present study. The metagenomes of the ocean, fresh water and DW samples were analysed by using the publicly available data on MG-RAST. The information for these ecosystems is provided in Table S6.