Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Arpp12BC04020610090ARPP-19    19kDa    Arpp19   
Arpp12NM_0215481009019kDa    ARPP-19    Arpp19   

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

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Text2Knowledge ... Yong Huang 2002