Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Hist1h2abNM_17566010090H2A.1    H2a-53    602795
HIST1H2ABAY1319839606602795
HIST1H2ABAY4052739606602795
HIST1H2ABAY4052749598
HIST1H2ABAY40527510090602795
HIST1H2ABNM_0035139606H2A/m    H2AFM    602795
Hist1h2abNT_03957810090602795
HIST1H2ABNT_0075929606H2A/m    H2AFM    602795
HIST1H2ABNG_0013359606H2A/m    H2AFM    602795

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

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Text2Knowledge ... Yong Huang 2002