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UniProtKB/Swiss-Prot is the manually annotated and reviewed section of the UniProt Knowledgebase (UniProtKB).
It is a high quality annotated and non-redundant protein sequence database, which brings together experimental results, computed features and scientific conclusions.
Since 2002, it is maintained by the UniProt consortium and is accessible via the UniProt website.

List of UniProtKB/Swiss-Prot (reviewed) entries.
Download - UniProt FTP sites.

Additional information:

Around UniProtKB/Swiss-Prot

NextProt - Exploring the universe of human proteins.
Viralzone - A portal to viral UniProtKB/Swiss-Prot entries.
HAMAP - High-quality Automated and Manual Annotation of Proteins.
SwissVar - A portal to Swiss-Prot diseases and variants.
Enzyme - A repository of information relative to the nomenclature of enzymes.

Protein Spotlight - One month, one protein.
Proteomics tools

Contact the UniProt helpdesk