Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hist2h3ca2NM_05404510090H3-614    M32461    H3.2-614    Hist2h3ca1    Hist2h3c2   
Hist2h3ca2BC01527010090H3-614    H3.2-614    Hist2h3ca1    Hist2h3c2   

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

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Text2Knowledge ... Yong Huang 2002