Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pghs2BC05290010090COX2    Cox-2    TIS10    PHS-2    Ptgs2   
Pghs2NM_01119810090COX2    Cox-2    PHS-2    TIS10    Ptgs2   
PGHS2AH0105069544
PGHS2AF2157349544
PGHS2AF2157359544

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

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Text2Knowledge ... Yong Huang 2002