Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HIST1H2AMAY1319939606602796
HIST1H2AMBC0327569606H2A/n    H2A.1    dJ193B12.1    H2AFN    602796
HIST1H2AMNM_0035149606H2A.1    H2A/n    H2AFN    dJ193B12.1    602796
HIST1H2AMNG_0000099606H2A.1    H2A/n    H2AFN    dJ193B12.1    602796

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

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Text2Knowledge ... Yong Huang 2002