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Phylogenetic tree of representative sequences for 280 OTUs. Nodes are coloured by best hit phylum classification, notable clades are highlighted in grey. Ring annotations represent mean relative abundances for the four countries surveyed; from out to in, China in red, Thailand in green, UK in blue and USA in purple. The 153 OTUs with geographic significant effects have coloured ring annotations, whereas non-significant OTUs ring annotations are grey
