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Nucleic Acids Res. 2014 Jan;42(Database issue):D568-73. doi: 10.1093/nar/gkt919. Epub 2013 Oct 16.

IMG/M 4 version of the integrated metagenome comparative analysis system.

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Biological Data Management and Technology Center, Computational Research Division Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, 94720 USA and Microbial Genome and Metagenome Program, Department of Energy Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA, 94598 USA.


IMG/M ( provides support for comparative analysis of microbial community aggregate genomes (metagenomes) in the context of a comprehensive set of reference genomes from all three domains of life, as well as plasmids, viruses and genome fragments. IMG/M's data content and analytical tools have expanded continuously since its first version was released in 2007. Since the last report published in the 2012 NAR Database Issue, IMG/M's database architecture, annotation and data integration pipelines and analysis tools have been extended to copewith the rapid growth in the number and size of metagenome data sets handled by the system. IMG/M data marts provide support for the analysis of publicly available genomes, expert review of metagenome annotations (IMG/M ER: and Human Microbiome Project (HMP)-specific metagenome samples (IMG/M HMP:

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