Your Query returns 16 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Rplp1NM_01885310090Arpp1    2410042H16Rik    C430017H15Rik    180520
Rplp1XM_34340310116
Rplp1NW_04779910116
RPLP1BC0075909606P1    RPP1    180520
RPLP1BC0033699606P1    RPP1    180520
RPLP1AY4181859606180520
RPLP1AY4181869598
RPLP1AY41818710090180520
RPLP1NM_0010039606P1    RPP1    180520
Rplp1NT_03947410090180520
Rplp1BC05868510090Arpp1    180520
rplP1AY5615197955
RPLP1NT_0101949606180520
RPLP1NM_2053229031
RpLP1NM_0572827227RpA2    RpP2    rp21C    CG4087    M(2)21C    M(2)21C1-2   
RpLP1NT_0337797227RpA2    RpP2    rp21C    CG4087    M(2)21C    M(2)21C1-2   

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

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Text2Knowledge ... Yong Huang 2002