Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
P1-CDC21BC0310619606CDC21    CDC54    MGC33310    hCdc21    MCM4   
P1-CDC21NM_0059149606CDC21    CDC54    hCdc21    MGC33310    MCM4   
P1-CDC21NM_1827469606CDC21    CDC54    hCdc21    MGC33310    MCM4   

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

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Text2Knowledge ... Yong Huang 2002