Rfam is an open access database (hosted at the Wellcome Trust Sanger Institute) containing information for RNA families and annotations for millions of RNA genes. Designed to work in a similar way to the Pfam database of protein families, Rfam uses a similar model for annotation and display and is built on the same principle of open access to the data. Each entry in the Rfam database includes multiple sequence alignments, a secondary structure and probabilistic models known as covariance models (CMs), these models can simultaneously handle an RNA sequence and its structure. In conjunction with the Infernal software package, Rfam CMs can be used to search genomes or other DNA sequence databases for homologs to known structural RNA families. You can find more about Rfam at http://rfam.janelia.org/
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