Your Query returns 17 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HES1BC0035879606ES1    GT335    D21S2048E    KNPI    KNP-Ia    KNPH    KNP-I    C21orf33    139605 601659
HES1BC0023709606ES1    GT335    D21S2048E    KNPI    KNPH    KNP-I    C21orf33    139605 601659
HES1NM_1981559606ES1    KNPH    KNPI    GT335    KNP-I    D21S2048E    C21orf33    139605 601659
HES1NM_0046499606ES1    KNPH    KNPI    GT335    KNP-I    D21S2048E    C21orf33    139605 601659
HES1U039144932
HES1Z751454932
Hes1NT_08236210090139605 601659
Hes1NM_00823510090Hry    139605 601659
Hes1NW_04735610116
Hes1NM_02436010116
HES1Y075729606139605 601659
HES1NM_0055249606HHL    HRY    HES-1    FLJ20408    139605 601659
Hes1NT_03962410090139605 601659
Hes1BC05142810090139605 601659
Hes1BC01837510090139605 601659
HES1NT_0056129606139605 601659
HES10N/AOSH5   

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

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Text2Knowledge ... Yong Huang 2002