Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
p49NM_01940810090lyt    p52    p50B    p49/p100    NF-kappaB2    Nfkb2   
p49BC02742310090lyt    p52    p50B    p49/p100    NF-kappaB2    Nfkb2   
p49AF499596192584PhopGV013   
p49NC_004062192584PhopGV013   
P49M642426334
p49AJ00675110456

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

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Text2Knowledge ... Yong Huang 2002