infernal - 1.1.5-2 main

Infernal ("INFERence of RNA ALignment") searches DNA sequence
databases for RNA structure and sequence similarities. It provides an
implementation of a special variant of profile stochastic context-free
grammars called covariance models (CMs). A CM is like a sequence
profile, but it scores a combination of sequence consensus and RNA
secondary structure consensus, so in many cases, it is more capable of
identifying RNA homologs that conserve their secondary structure more
than their primary sequence.
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The tool is an integral component of the Rfam database.