Your Query returns 7 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
hsp90betaBC0653597955fa91e11    wu:fa91e11    hsp90b   
hsp90betaNM_1313107955fa91e11    wu:fa91e11    hsp90b   
hsp90betaX832309031
Hsp90betaAB0436769796
hsp90betaAB0723699913
HSP90BETAAF2757199606
hsp90betaAF0421087955

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

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Text2Knowledge ... Yong Huang 2002