We study the selfenergy of the $Theta^+$ pentaquark in nuclei associated with two types of interaction: the KN decay of the $Theta^+$ and two meson baryon decay channels of the $Theta^+$. Whereas the potential related to the first source is quite weak, the second kind of interaction produces a large and attractive potential that could lead to the existence of $Theta^+$ nuclear bound states.
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