Your Query returns 13 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
H2A.1NM_17566010090H2a-53    Hist1h2ab   
H2A.1BC0327569606H2A/n    dJ193B12.1    H2AFN    HIST1H2AM   
H2A.1NM_0582337227H2A    His2a    DmeH2a    HisC    H2[[A]]   
H2A.1NM_0035149606H2A/n    H2AFN    dJ193B12.1    HIST1H2AM   
H2A.1NM_0210529606H2A.2    H2A/a    H2AFA    HIST1H2AE   
H2A.1NT_0075929606H2A.2    H2A/a    H2AFA    HIST1H2AE   
H2A.1NT_0075929606H2A/n    H2AFN   
H2A.1NG_0000099606H2A/n    H2AFN    dJ193B12.1    HIST1H2AM   
H2A.1NG_0013359606H2A.2    H2A/a    H2AFA    HIST1H2AE   
H2A.1L188925911
H2A.1AJ49484834765
H2A.1AJ00695940559
H2A.1X571389606

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

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Text2Knowledge ... Yong Huang 2002