Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
PCOX1BC0298409606PGHS-1    PGG/HS    COX1    PTGHS    PGHS1    COX3    PHS1    PTGS1    176805
PCOX1NM_0009629606COX1    COX3    PHS1    PGHS1    PTGHS    PGG/HS    PGHS-1    PTGS1    176805
PCOX1NM_0805919606COX1    COX3    PHS1    PGHS1    PTGHS    PGG/HS    PGHS-1    PTGS1    176805
pcox1AJ00511210141

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

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Text2Knowledge ... Yong Huang 2002