Your Query returns 20 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CEACAM1AY3451279913
CEACAM1AY3451289913
CEACAM1AY3451299913
CEACAM1AY3451309913
CEACAM1AY4874169913
CEACAM1AY4874179913
CEACAM1AY4874189913
CEACAM1AY4874199913
Ceacam1NW_04755610116
CEACAM1BC0144739606BGP    BGP1    BGPI    CD66    CD66a    109770
CEACAM1NM_0017129606BGP    BGP1    BGPI    CD66    CD66A    109770
ceacam1AJ27710410116
ceacam1AJ27710510116
Ceacam1NT_03942010090109770
Ceacam1AF28791110090109770
Ceacam1BC01689110090MHVR    bb-1    CD66a    mCEA1    mmCGM1    mmCGM2    mmCGM1a    C-CAM    109770
Ceacam1NM_01192610090Bgp    Hv2    Bgp1    Cea1    Cea7    Hv-2    MHVR    bb-1    C-CAM    CD66a    Cea-1    Cea-7    Mhv-1    mCEA1    mmCGM1    mmCGM2    mmCGM1a    109770
CEACAM1NT_0111099606109770
CEACAM1NM_2057889913
Ceacam1NM_03175510116Bgp    BGPR    CD66a    Ccam1   

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

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Text2Knowledge ... Yong Huang 2002