Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
M(2)21C1-2NG_0000797227rpA2    rp21C    CG4087    CT13554    M(2)21C    RpP2   
M(2)21C1-2NM_0572827227RpA2    RpP2    rp21C    CG4087    M(2)21C    RpLP1   
M(2)21C1-2NT_0337797227RpA2    RpP2    rp21C    CG4087    M(2)21C    RpLP1   

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

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Text2Knowledge ... Yong Huang 2002