Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ccna2NM_1529497955CycA2    cb671    fi36f03    chunp6924    wu:fi36f03   
Ccna2NM_00982810090Ccn1    Ccna    Cyca    Ccn-1   
Ccna2XM_34222910116
Ccna2NW_04762510116
CCNA2AY4182039606
CCNA2AY4182049598
CCNA2AY41820510090
CCNA2NM_0012379606CCN1    CCNA   
CCNA2AF5180069606
Ccna2NT_03922810090
Ccna2BC05273010090
CCNA2NT_0163549606

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

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Text2Knowledge ... Yong Huang 2002