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Secondary structure of the EBNA1 protein and the Nm23-H1 protein. The structure of EBNA1 includes the DNA-binding domain and the dimerization domains, as well as in internal Gly-Ala repeats. The region required for looping, the Gly-Ala repeats, and nuclear localization signal is also shown. The structure of Nm23-H1 shows the four beta sheets, the five alpha-helical regions and two regions referred to as the head and the K-pn loop.
