Your Query returns 9 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HAP-1NM_01040410090MGC31449    Hap1   
HAP-1NM_17798110090MGC31449    Hap1   
HAP-1BC05304310090MGC31449    Hap1   
HAP-1BC03408910090MGC31449    Hap1   
hap-1AY0527726239
hap-1U8970857678
hap-1NC_0032816239ZC395.7    CELK07921   
hap-1NM_0657206239ZC395.7    CELK07921   
HAP-1AJ0128249606

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

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Text2Knowledge ... Yong Huang 2002