Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
H2B/fNM_0210629606H2B.1    H2BFF    HIST1H2BB   
H2B/fNT_0075929606H2B.1    H2BFF    HIST1H2BB   
H2B/fNG_0013359606H2B.1    H2BFF    HIST1H2BB   

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

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Text2Knowledge ... Yong Huang 2002