Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
H1f1NM_03060910090H1a    H1.1    H1var3    Hist1h1a    142709
H1F1NM_0053259606H1.1    HIST1    HIST1H1A    142709
H1F1NT_0075929606H1.1    HIST1    HIST1H1A    142709
H1F1NG_0013359606H1.1    HIST1    HIST1H1A    142709

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

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Text2Knowledge ... Yong Huang 2002