GET /uniprotkb/{accession}

Retrieve complete details for a specific protein entry by its UniProt accession number. This returns the full protein record including sequence, functional annotations, cross-references, protein interactions, disease associations, and all curated metadata. Use this endpoint when you already know the accession number (e.g., P01308 for human insulin) and need comprehensive information about that specific protein. Unlike the search endpoint, this returns a single complete record rather than a list of results. The `format` parameter allows requesting JSON (structured data), XML (legacy format), or TXT (flat file format).