Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
p50BNM_01940810090lyt    p49    p52    p49/p100    NF-kappaB2    Nfkb2   
p50BBC02742310090lyt    p49    p52    p49/p100    NF-kappaB2    Nfkb2   
p50BD163679031

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

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Text2Knowledge ... Yong Huang 2002