PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX sio: <http://semanticscience.org/resource/>

SELECT DISTINCT
    STR(?classID) AS ?classID

WHERE {
    <http://identifiers.org/uniprot/%s> sio:SIO_000095 ?classIRI.
    ?classIRI dcterms:identifier ?classID
    }