Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rpl20-1Z953954896rpl18a-2    rpl20    rpl2001    SPAC3A12.10    yl17b   
rpl20-1NC_0034244896SPAC3A12.10    rpl18a-2    yl17b   
rpl20-1AF1279134896
rpl20-1NC_0034244896SPAC26A3.04    rpl18a-2    yl17b   

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

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Text2Knowledge ... Yong Huang 2002