Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ptgs1AY0285847955
ptgs1NM_1536567955zCOX-1   
Ptgs1NM_00896910090COX1    Cox-1    Cox-3    Pghs1    176805
Ptgs1NM_01704310116
PTGS1AF4402049606176805
PTGS1BC0298409606PGHS-1    PGG/HS    COX1    PTGHS    PGHS1    COX3    PCOX1    PHS1    176805
PTGS1AY4496889606176805
PTGS1AY4151409606176805
PTGS1AY4151419598
PTGS1AY41514210090176805
PTGS1NM_0009629606COX1    COX3    PHS1    PCOX1    PGHS1    PTGHS    PGG/HS    PGHS-1    176805
PTGS1NM_0805919606COX1    COX3    PHS1    PCOX1    PGHS1    PTGHS    PGG/HS    PGHS-1    176805
Ptgs1NT_03920610090176805
Ptgs1BC00557310090COX1    Cox-1    Pghs1    176805
Ptgs1BC02332210090COX1    Cox-1    Pghs1    176805
Ptgs1NC_004757228410COX1    Cox-1    Pghs1   
PTGS1NT_0084709606176805

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

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Text2Knowledge ... Yong Huang 2002