Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hist1h1aNM_03060910090H1a    H1.1    H1f1    H1var3    142709
HIST1H1AAF5312999606142709
HIST1H1ANM_0053259606H1.1    H1F1    HIST1    142709
Hist1h1aNT_03957810090142709
HIST1H1ANT_0075929606H1.1    H1F1    HIST1    142709
HIST1H1ANG_0013359606H1.1    H1F1    HIST1    142709

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

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Text2Knowledge ... Yong Huang 2002