Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HP1-BETABC0026099606CBX    M31    HP1Hs-beta    MOD1    CBX1   
HP1-BETABC0213029606CBX    M31    HP1Hs-beta    MOD1    CBX1   
HP1-BETANM_0068079606CBX    M31    MOD1    HP1Hs-beta    CBX1   

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

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Text2Knowledge ... Yong Huang 2002