Your Query returns 27 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ptgs2AY0285857955
ptgs2BC0567367955zCOX-2    fj02a10    wu:fj02a10   
ptgs2BC0632327955zCOX-2    fj02a10    wu:fj02a10   
PTGS2D282359606600262
Ptgs2NW_04739710116
PTGS2AY2299899606600262
PTGS2AY3826299606600262
PTGS2BC0137349606COX-2    COX2    hCox-2    PHS-2    PGHS-2    PGG/HS    600262
PTGS2AL0335339606600262
PTGS2AF2769539606COX2    600262
PTGS2NM_0009639606COX2    COX-2    PHS-2    PGG/HS    PGHS-2    hCox-2    600262
PTGS2NM_1744459913
Ptgs2NT_03918410090600262
Ptgs2AY42653210036COX2   
Ptgs2BC05290010090COX2    Cox-2    Pghs2    TIS10    PHS-2    600262
PTGS2G321169823
PTGS2G321159823
PTGS2G673679823
PTGS2G679299606600262
PTGS2G679309606600262
PTGS2G754119606600262
PTGS2G754129606600262
PTGS2G754139606600262
ptgs2NM_1536577955zCOX-2    fj02a10    unp1239    wu:fj02a10   
Ptgs2NM_01119810090COX2    Cox-2    PHS-2    Pghs2    TIS10    600262
PTGS2NT_0044879606600262
Ptgs2NM_01723210116Cox2    COX-2   

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

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Text2Knowledge ... Yong Huang 2002