Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CcnaNM_00982810090Ccn1    Cyca    Ccn-1    Ccna2    123835
CCNANM_0012379606CCN1    CCNA2    123835

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

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Text2Knowledge ... Yong Huang 2002