A bioethicist from the University of Minnesota has filed a complaint with the Food and Drug Administration over Celltex Therapeutics Corp., a Houston company involved in adult stem cells. Leigh Turner alleges that Celltex is not complying with FDA regulations in its operations and poses a threat to patients. The company, which opened last year, stores and processes adult stem cells, which doctors then reinject into their patients. Texas is in the process of setting up review committees that would oversee new and experimental therapies, like adult stem cell therapy. The Texas Medical Board is set to approve the new policy in April, and Celltex has registered with one of the oversight committees.