The small subunit ribosomal RNA is a useful phylogenetic marker that has been used extensively for evolutionary analyses. The RefSeq dataset contains curated 16S ribosomal RNA sequences that correspond to bacteria type materials. The RefSeq records may contain corrections to the sequence or taxonomy as compared to the original INSD submission, and may have additional information added that is not found in the original. All sequences will have the same project ID and can be found as such. Database URL: http://www.ncbi.nlm.nih.gov/bioproject/PRJNA33175.