ArchaeaPhylogenyArchaeal ProteinsGenes, ArchaealDNA, ArchaealRNA, ArchaealGenome, ArchaealBacteriaRNA, Ribosomal, 16SCrenarchaeotaMolecular Sequence DataDNA, RibosomalMethaneBacteroidetesGene Expression Regulation, ArchaealHaloferax volcaniiSequence Analysis, DNAMethanococcusEvolution, MolecularGeologic SedimentsSulfolobusBiodiversityMethanobacteriaceaeSeawaterGenes, rRNAPoriferaEuryarchaeotaDNA, BacterialEukaryotaMetagenomeInvertebratesProteobacteriaMethanosarcinaNitrificationAmino Acid SequenceChloroflexiMethanobacteriumDesulfurococcaceaeSequence AlignmentMethanosarcinalesHalobacterialesCnidariaHaloferaxAnnelidaSoil MicrobiologyBiotaBase CompositionPyrococcusEukaryotic CellsSulfolobus acidocaldariusGenome, BacterialMethanosarcinaceaePyrococcus abyssiMetagenomicsRNA, BacterialBase SequencePlatyhelminthsChromosomes, ArchaealSequence Homology, Amino AcidSulfolobus solfataricusMethanococcalesWater MicrobiologyCytophagaArchaeoglobus fulgidusPyrococcus furiosusProkaryotic CellsHot SpringsHydrozoaSpecies SpecificityCtenophoraThermococcusMethanosarcina barkeriBiological EvolutionHalobacteriaceaeAmmoniaGene Transfer, HorizontalEcosystemBacterial Physiological PhenomenaEchinodermataArchaeal VirusesCluster AnalysisBacterial ProteinsConserved SequenceApicomplexaMicrobial ConsortiaGlyceryl EthersRNA, Ribosomal, 18SAnaerobiosisAcidobacteriaThermoplasmaActinobacteriaFresh WaterPlacozoaFungiMicrobiotaHeterotrophic ProcessesBioreactorsSequence Homology, Nucleic AcidAutotrophic ProcessesHaloferax mediterranei