Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HIF-1alphaNM_01043110090MOP1    Hif1a   
HIF-1alphaBC0125279606MOP1    HIF1-ALPHA    HIF1A   
HIF-1alphaNM_0015309606MOP1    HIF1-ALPHA    HIF1A   
HIF-1alphaNM_1810549606MOP1    HIF1-ALPHA    HIF1A   
HIF-1alphaX9558010090
hif-1alphaAY4502697959

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

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Text2Knowledge ... Yong Huang 2002