Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CDC54BC0310619606CDC21    MGC33310    P1-CDC21    hCdc21    MCM4   
CDC54NM_0059149606CDC21    hCdc21    MGC33310    P1-CDC21    MCM4   
CDC54NM_1827469606CDC21    hCdc21    MGC33310    P1-CDC21    MCM4   
CDC54U147314932
CDC54Z712554932
CDC54NC_0011484932HCD21    MCM4   

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

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Text2Knowledge ... Yong Huang 2002