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DK and AS constructed the SPI mutants, FS, HH, AMS and AI were responsible for the animal experiments. SAHA manufacturer VK and BN analysed the samples by histology scoring and JV performed the cytokine expression by RT PCR. IR together with BN designed the experiments and wrote the manuscript. All authors read and approved the final manuscript.”
“Background The Roseobacter clade is a lineage of

the Rhodobacteraceae within the Alphaproteobacteria. It is the most abundant and diverse group of marine Gram-negative, non-obligately phototrophic prokaryotes. They represent up to 25% of marine communities, especially in coastal and polar regions [reviewed in [1, 2]]. Currently, 41 subclusters are described, covering all major oceanic habitats like seawater, algal blooms, microbial mats, sediments, sea ice and marine invertebrates [2]. Members of the Roseobacter clade display this website diverse physiologies. For example, some members can generate energy via aerobic anoxygenic photosynthesis, oxidize the green-house gas carbon monoxide and produce the climate-relevant gas dimethylsulfide through the degradation of different sulphur compounds. Thereby, these bacteria significantly influence the global carbon and sulphur cycles as well as the climate [2]. Moreover, they are able to degrade aromatic

compounds, reduce trace metals, produce bioactive secondary metabolites, perform quorum sensing and can establish symbiotic and pathogenic relationships [1–5]. Several members of the Roseobacter clade have been implicated as causative agents of juvenile oyster disease in Eastern GNA12 oyster and black band disease in AZD8931 order scleractina coral [2, 6], or were described as probiotics for fish larvae [7, 8]. Scientific interest in this bacterial group increased steadily since the description of its first representatives Roseobacter denitrificans and Roseobacter litoralis [9]. Since the first genomes of Silicibacter pomeroyi and R. denitrificans have been completely elucidated [10, 11] a massive genome sequencing approach financed by the Gordon & Betty Moore foundation resulted in currently 23 draft and 5 finished genome sequences from the Roseobacter clade.