Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
[a]1bNM_00741610090Adra1b   
[a]1bBC03700210090Adra1b   

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

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Text2Knowledge ... Yong Huang 2002