The Pfam database is a large collection of protein
families, each represented by multiple sequence alignments
and hidden Markov models (HMMs).
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Proteins are generally composed of one or more functional regions,
commonly termed domains. Different combinations of domains give
rise to the diverse range of proteins found in nature. The identification
of domains that occur within proteins can therefore provide insights
into their function.
Pfam also generates higher-level groupings of related entries, known as
clans. A clan is a collection of Pfam entries which are
related by similarity of sequence, structure or profile-HMM.
The data presented for each entry is based on the
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but information on individual UniProtKB sequences can still be found by entering the protein accession.
Pfam full alignments are available from searching a variety of databases, either to provide
different accessions (e.g. all UniProt and NCBI GI) or different levels of redundancy.