Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hmgcs2NM_00825610090mHS    1300002P16    600234
Hmgcs2NW_04762710116
HMGCS2BC0442179606600234
HMGCS2AY4166709606600234
HMGCS2AY4166719598
HMGCS2AY41667210090600234
HMGCS2NM_0055189606600234
Hmgcs2NT_03923810090600234
Hmgcs2BC01471410090mHS    1300002P16    600234
Hmgcs2BC02474410090mHS    1300002P16    600234
Hmgcs2NM_17309410116Hmgcs1    Mt3h3mg   
HMGCS2NT_0047549606600234

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

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Text2Knowledge ... Yong Huang 2002