Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hist2h4NM_03359610090H4    X04652   
HIST2H4AF5256829606
HIST2H4NM_0035489606H4    H4F2    H4FN   
Hist2h4NT_08025010090
HIST2H4NT_0329629606

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

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Text2Knowledge ... Yong Huang 2002