Your Query returns 15 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hey2NM_1316227955grl   
Hey2NM_01390410090CHF1    Hrt2    Herp1    hesr2   
Hey2XM_34480610116
Hey2NW_04754910116
HEY2BC0077079606GRL    HERP1   
Hey2AB0447559606
Hey2AJ2495459606
HEY2AY4081629606
HEY2AY4081639598
HEY2AY40816410090
HEY2NM_0122599606GRL    HERP1   
Hey2AJ27750810090
Hey2AJ27186710090
Hey2NT_03949210090
HEY2NT_0257419606

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

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Text2Knowledge ... Yong Huang 2002