Your Query returns 16 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Cbx3NM_00762410090M32    HP1g   
CBX3BC0009549606HECH    GAMMA    HP1-GAMMA    HP1Hs-gamma   
CBX3AY4033299606
CBX3AY4033309598
CBX3AY40333110090
CBX3NM_0072769606HECH    GAMMA    HP1-GAMMA    HP1Hs-gamma   
CBX3NM_0165879606HECH    GAMMA    HP1-GAMMA    HP1Hs-gamma   
Cbx3NT_03934310090
Cbx3AF13330010090
Cbx3AJ27861610090
Cbx3AJ27861710090
Cbx3AJ27861810090
Cbx3AJ27861910090
Cbx3BC01835410090M32    HP1g   
CBX3NT_0078199606
CBX3NT_0795929606

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

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Text2Knowledge ... Yong Huang 2002