Your Query returns 8 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hesr-1NM_01042310090HRT1    Herp2    Hey1   
HESR-1BC0018739606CHF2    HESR1    HRT-1    CHF-2    HERP2    HEY1   
HESR-1NM_0122589606CHF2    CHF-2    HERP2    HESR1    HRT-1    HEY1   
Hesr-1NM_0789337227dHey    d-hey    CG11194    Hey   
Hesr-1NT_0337787227dHey    d-hey    CG11194    Hey   
Hesr-1AF1515237227
HESR-1AF1515229606
Hesr-1AF15152110090

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

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Text2Knowledge ... Yong Huang 2002