Fig. 2From: Genomic evidence for sulfur intermediates as new biogeochemical hubs in a model aquatic microbial ecosystemDistribution of sulfur cycling genes. a Vertical profiles of sulfur cycling genes identified in metagenomes along geochemical gradients (heat map of salinity, oxygen, SO42− and H2S). Hierarchical clustering at the right was computed based on all KEGG orthologues identified in metagenomes. Numbers of genes per sample and per gene are after normalization. b Schematic representation of the sulfur cycle. Names of the enzymes are available in Supplementary Table S1Back to article page