Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
CD120bNM_01161010090p75    TNFBR    Tnfr2    TNF-R2    TNFR80    Tnfr-1    TNF-R75    TNF-R-II    Tnfrsf1b   
CD120bBC0118449606TNF-R-II    TNFBR    TNFR2    TNFR80    p75TNFR    TBPII    TNF-R75    p75    TNFRSF1B   
CD120bBC0529779606TNF-R-II    TNFBR    TNFR2    TNFR80    p75TNFR    TBPII    TNF-R75    p75    TNFRSF1B   
CD120bNM_0010669606p75    TBPII    TNFBR    TNFR2    TNFR80    TNF-R75    p75TNFR    TNF-R-II    TNFRSF1B   

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

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Text2Knowledge ... Yong Huang 2002