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Each repeat
present a short helix H1, and two longer helices H2 and H3
(except R7, - H3).
The positively
charged groove that spans the entire super helical armadillo
repeat region constitute the binding
surface for the majority of more than 20 b-catenin partners. Tcf, APC and
E-cadherin have essentially the same binding site in the
structural groove.
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