Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
p21-ArNM_0198241009021kDa    p21Arc    1110006A04Rik    Arpc3   
p21-ArBC01361810090p21Arc    21kDa    Arpc3   
p21-ArBC05444010090p21Arc    21kDa    Arpc3   

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

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Text2Knowledge ... Yong Huang 2002