COMPILATION OF SMALL RIBOSOMAL-SUBUNIT RNA STRUCTURES

The database on small ribosomal subunit RNA structure contained 1804 n ucleotide sequences on April 23, 1993. This number comprises 365 eukar yotic, 65 archaeal, 1260 bacterial, 30 plastidial, and 84 mitochondria l sequences. These are,stored in the form of an alignment in order to facilitate the use of the database as input for comparative studies on higher-order structure and for reconstruction of phylogenetic trees. The elements of the postulated secondary structure for each molecule a re indicated by special symbols. The database is available on-line dir ectly from the authors by ftp and can also be obtained from the EMBL n ucleotide sequence library by electronic mail, ftp, and on CD ROM disk .