Your Query returns 4 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
IKK2NM_01054610090IKK-2    IKK[b]    IKK-beta    Ikbkb   
IKK2BC0062319606IKK-beta    NFKBIKB    IKKB    IKBKB   
IKK2BC03772310090IKK-2    IKK[b]    IKK-beta    Ikbkb   
IKK2NM_0015569606IKKB    NFKBIKB    IKK-beta    IKBKB   

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

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Text2Knowledge ... Yong Huang 2002