Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Arpp1NM_018853100902410042H16Rik    C430017H15Rik    Rplp1   
Arpp1BC05868510090Rplp1   

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

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Text2Knowledge ... Yong Huang 2002