Your Query returns 5 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CD66aBC0144739606BGP    BGP1    BGPI    CD66    CEACAM1   
CD66ANM_0017129606BGP    BGP1    BGPI    CD66    CEACAM1   
CD66aBC01689110090MHVR    bb-1    mCEA1    mmCGM1    mmCGM2    mmCGM1a    C-CAM    Ceacam1   
CD66aNM_01192610090Bgp    Hv2    Bgp1    Cea1    Cea7    Hv-2    MHVR    bb-1    C-CAM    Cea-1    Cea-7    Mhv-1    mCEA1    mmCGM1    mmCGM2    mmCGM1a    Ceacam1   
CD66aNM_03175510116Bgp    BGPR    Ccam1    Ceacam1   

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

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Text2Knowledge ... Yong Huang 2002