BAR 3.0 is a server for the annotation of protein sequences relying on a comparative large-scale analysis on the entire UniProt. With BAR 3.0 and a sequence you can annotate when possible: function (Gene Ontology), structure (Protein Data Bank), protein domains (Pfam). Also if your sequence falls into a cluster with a structural/some structural template/s we provide an alignment towards the template/templates based on the Cluster-HMM (HMM profile) that allows you to directly compute your 3D model. Cluster HMMs are available for downloading.
In this web site they make use of "Technical Cookies".
Categories of search terms are used to yield clusters matching those classifying terms, accessions or IDs. Sequences (FASTA format) can also be used to initiate a search. Caution is advised, as the accuracy of this tool's results is highly-dependent upon the accuracy of annotation in UniProt, from which it pulls and pools information. Creators of site also provide several other bioinformatic services, tools: Bologna Biocomputing Group
Very easy to use and self-explanatory