Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hmgcs1BC0494567955MGC56481    zgc:56481   
Hmgcs1NM_2010857955MGC56481    zgc:56481   
Hmgcs1NM_17309410116Mt3h3mg    Hmgcs2   
Hmgcs1NM_14594210090MGC36662    B130032C06Rik    142940
Hmgcs1NW_04762010116
Hmgcs1NM_01726810116
HMGCS1BC0002979606HMGCS    142940
HMGCS1NM_0021309606HMGCS    142940
Hmgcs1NT_07873110090142940
Hmgcs1BC02385110090MGC36662    142940
Hmgcs1BC02969310090MGC36662    142940
Hmgcs1BC03136310090MGC36662    142940
Hmgcs1BC03431710090MGC36662    142940
HMGCS1NT_0065769606142940

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

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Text2Knowledge ... Yong Huang 2002