Filter orthologes by subtype

Database: 
Statement: 

Devuelve los ortologos

Query: 
SELECT ?x FROM <http://khaos.uma.es/olivedb> WHERE { ?x <http://khaos.uma.es/vocab/has_annotation> ?y. ?y a <http://khaos.uma.es/vocab/orthologue>. ?y <http://khaos.uma.es/vocab/orthologue_subtype> ?z FILTER(REGEX(?z,"RefSeq_Athaliana_database")) } ORDER BY ?x