Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
rpl18a-2Z953954896rpl20    rpl20-1    rpl2001    SPAC3A12.10    yl17b   
rpl18a-2NC_0034244896SPAC3A12.10    rpl20-1    yl17b   
rpl18a-2NC_0034244896SPAC26A3.04    yl17b    rpl20-1   

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

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Text2Knowledge ... Yong Huang 2002