Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HP1-GAMMABC0009549606HECH    GAMMA    HP1Hs-gamma    CBX3   
HP1-GAMMANM_0072769606HECH    GAMMA    HP1Hs-gamma    CBX3   
HP1-GAMMANM_0165879606HECH    GAMMA    HP1Hs-gamma    CBX3   
hp1-gammaAB0309059606

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

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Text2Knowledge ... Yong Huang 2002