Release 117 of the database (January 2014) held more than 4,000,000 small subunit (SSU - 16S/18S) and 400,000 large subunit (LSU - 23S/28S) sequences.[failed verification] Sequences are provided as files for the ARB software environment.
↑Elmar Pruesse, Christian Quast, Katrin Knittel, Bernhard M. Fuchs, Wolfgang Ludwig, Jörg Peplies, Frank Oliver Glöckner (2007). SILVA: a comprehensive online resource for quality checked and aligned ribosomal RNA sequence data compatible with ARB[link removed]. Nucleic Acids Research35 (21): 7188-7196. doi:10.1093/nar/gkm864[independent source needed]