Your Query returns 6 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hist1h2bbNM_17566410090H2b-143    602803
HIST1H2BBAF5312859606602803
HIST1H2BBNM_0210629606H2B.1    H2B/f    H2BFF    602803
Hist1h2bbNT_03957810090602803
HIST1H2BBNT_0075929606H2B.1    H2B/f    H2BFF    602803
HIST1H2BBNG_0013359606H2B.1    H2B/f    H2BFF    602803

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

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Text2Knowledge ... Yong Huang 2002