Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HIF1-ALPHABC0125279606MOP1    HIF-1alpha    HIF1A   
HIF1-ALPHANM_0015309606MOP1    HIF-1alpha    HIF1A   
HIF1-ALPHANM_1810549606MOP1    HIF-1alpha    HIF1A   
HIF1-alphaAF19357410141

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

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Text2Knowledge ... Yong Huang 2002