Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HERG1BC0043119606HERG    LQT2    Kv11.1    ERG1    KCNH2   
HERG1NM_0002389606ERG1    HERG    LQT2    Kv11.1    KCNH2   
HERG1NM_1720569606ERG1    HERG    LQT2    Kv11.1    KCNH2   
HERG1NM_1720579606ERG1    HERG    LQT2    Kv11.1    KCNH2   
HERG1BC0019149606HERG    LQT2    Kv11.1    ERG1    KCNH2   

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

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Text2Knowledge ... Yong Huang 2002