US actor Nick Nolte examines a model of a knee ahead of a conference on molecular medicine in Duesseldorf, Germany, 4 January 2005. Nolte, who suffered from problems with his knee, is the patron of the conference on new approaches in the therapy of arthrosis through the regeneration of cartilage produced from bown marrow stem cells. (KEYSTONE/DPA/Roland Weihrauch) === ===
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