Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Rpp20NM_028753100900610037N12Rik    Pop7    606113
RPP20NM_0058379606RPP2    POP7    606113
RPP20NM_1982029606RPP2    HSPC004    POP5    606113
RPP20NM_0159189606RPP2    HSPC004    POP5    606113
RPP20NM_1982019606RPP2    HSPC004    POP5    606113
RPP20BC0125059606HSPC004    RPP2    POP5    606113
RPP20BC0014309606RPP2    POP7    606113
RPP20U943169606606113
Rpp20AF31203310090606113
RPP20NT_0079339606606113
RPP20NT_0795959606606113

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

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Text2Knowledge ... Yong Huang 2002