Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hrt2NM_01390410090CHF1    Herp1    hesr2    Hey2   
HRT2NC_0011474932RBX1    ROC1    HRT1   
HRT2AB0646613981
Hrt2AF17228710090

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

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Text2Knowledge ... Yong Huang 2002