Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Rad6bNM_00945810090HR6B    E2-14k    Ube2b    179095
RAD6BBC0084709606HHR6B    UBC2    HR6B    E2-17kDa    UBE2B    179095
RAD6BBC0084049606HHR6B    UBC2    HR6B    E2-17kDa    UBE2B    179095
RAD6BBC0059799606HHR6B    UBC2    HR6B    E2-17kDa    UBE2B    179095
RAD6BNM_0033379606HR6B    UBC2    HHR6B    E2-17kDa    UBE2B    179095

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

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Text2Knowledge ... Yong Huang 2002