Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ARC21NM_0057199606p21-Arc    ARPC3   
ARC21BC0677479606p21-Arc    ARPC3   
ARC21AF0060869606

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

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Text2Knowledge ... Yong Huang 2002