Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
p57Kip2NM_00987610090CDKI    Kip2    p57(kip2)    Cdkn1c   
p57Kip2BC00541210090Kip2    p57(kip2)    CDKI    Cdkn1c   
p57Kip2AF16019010090
p57kip2AJ48829110116

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

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Text2Knowledge ... Yong Huang 2002