Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hCox-2BC0137349606COX-2    COX2    PHS-2    PGHS-2    PGG/HS    PTGS2   
hCox-2NM_0009639606COX2    COX-2    PHS-2    PGG/HS    PGHS-2    PTGS2   
hCox-2U046369606

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

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Text2Knowledge ... Yong Huang 2002