Your Query returns 9 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hist1h2aeNM_178187100901190022L06    602786
HIST1H2AEAY1319869606602786
HIST1H2AEAY4005219606602786
HIST1H2AEAY4005229598
HIST1H2AEAY40052310090602786
HIST1H2AENM_0210529606H2A.1    H2A.2    H2A/a    H2AFA    602786
Hist1h2aeNT_03957810090602786
HIST1H2AENT_0075929606H2A.1    H2A.2    H2A/a    H2AFA    602786
HIST1H2AENG_0013359606H2A.1    H2A.2    H2A/a    H2AFA    602786

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

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Text2Knowledge ... Yong Huang 2002