Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
PHS-2BC0137349606COX-2    COX2    hCox-2    PGHS-2    PGG/HS    PTGS2   
PHS-2NM_0009639606COX2    COX-2    PGG/HS    PGHS-2    hCox-2    PTGS2   
PHS-2BC05290010090COX2    Cox-2    Pghs2    TIS10    Ptgs2   
PHS-2NM_01119810090COX2    Cox-2    Pghs2    TIS10    Ptgs2   
PHS-2U448059606

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

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Text2Knowledge ... Yong Huang 2002