p50 DD and p65 DD are present in this structure

Protein science : a publication of the Protein Society
Comparison of backbone dynamics of the p50 dimerization domain of NFκB in the homodimeric transcription factor NFκB1 and in its heterodimeric complex with RelA (p65).

p50 dimerization domain in complex with p65 DD

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heterodimer of p50 dimerization domain with p65 dimerization domain

Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax