Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
PGG/HSBC0137349606COX-2    COX2    hCox-2    PHS-2    PGHS-2    PTGS2   
PGG/HSBC0298409606PGHS-1    COX1    PTGHS    PGHS1    COX3    PCOX1    PHS1    PTGS1   
PGG/HSNM_0009629606COX1    COX3    PHS1    PCOX1    PGHS1    PTGHS    PGHS-1    PTGS1   
PGG/HSNM_0009639606COX2    COX-2    PHS-2    PGHS-2    hCox-2    PTGS2   
PGG/HSNM_0805919606COX1    COX3    PHS1    PCOX1    PGHS1    PTGHS    PGHS-1    PTGS1   

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002