Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CD121aNM_00836210090CD121b    Il1r-1    Il1r1   
CD121ANM_0008779606P80    IL1R    IL1RA    D2S1473    IL-1R-alpha    IL1R1   
CD121ABC0675069606IL1R    IL1RA    IL-1R-alpha    P80    D2S1473    IL1R1   
CD121ABC0675079606IL1R    IL1RA    IL-1R-alpha    P80    D2S1473    IL1R1   
CD121ABC0675089606IL1R    IL1RA    IL-1R-alpha    P80    D2S1473    IL1R1   

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

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Text2Knowledge ... Yong Huang 2002