Your Query returns 16 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hey1AJ5102217955
hey1AJ6210018090
Hey1NM_01042310090HRT1    Herp2    hesr-1   
Hey1XM_34221610116
Hey1NW_04762410116
HEY1BC0018739606HESR-1    CHF2    HESR1    HRT-1    CHF-2    HERP2   
HEY1AJ2722149606
HEY1AJ2775069606
HEY1AY4081209606
HEY1AY4081219598
HEY1AY40812210090
HEY1NM_0122589606CHF2    CHF-2    HERP2    HESR1    HRT-1    HESR-1   
Hey1NT_03922610090
Hey1AJ27750710090
Hey1AJ24389510090
HEY1NT_0081839606

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

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Text2Knowledge ... Yong Huang 2002