Your Query returns 13 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Cbx1BC0454437955fe14b09    zgc:55739    wu:fe14b09   
Cbx1NM_1997467955fe14b09    zgc:55739    wu:fe14b09   
Cbx1NM_00762210090Cbx    M31    MOD1    Cbx-rs2   
CBX1BC0026099606CBX    HP1-BETA    M31    HP1Hs-beta    MOD1   
CBX1BC0213029606CBX    HP1-BETA    M31    HP1Hs-beta    MOD1   
CBX1AF1068019606
CBX1AY4146639606
CBX1AY4146649598
CBX1AY41466510090
CBX1NM_0068079606CBX    M31    MOD1    HP1-BETA    HP1Hs-beta   
Cbx1NT_03952110090
CBX1NT_0107839606
CBX1NM_2043329031

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

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Text2Knowledge ... Yong Huang 2002