No current therapies or reparative measures exist to replace such defective hair cells in humans. Past leaders' teachings on reparative therapy and the origins of homosexuality have been criticized. Activists have compared Zucker's approaches with reparative therapy. Exodus International once believed reparative therapy could be a beneficial tool. While reparative regeneration is a rare phenomenon in mammals, it does occur. Peterson had experience with reparative therapy while working at a prison clinic for sex offenders. Reparative regeneration has also been observed in rabbits, pikas and African spiny mice. Exodus International considers reparative therapy to be a useful tool, but not a necessary one. Following TBI, there are both reparative and degenerative mechanisms that lead to an inflammatory environment. Synthetic GHK-Cu is used in cosmetics as a reparative and anti-aging ingredient. Remineralisation is the reparative process of tooth substance. Nevertheless, they do not prevent an infection and also inhibit later reparative processes. In October 2011, Mehran suffered a bucket tear of the lateral meniscus requiring reparative surgery. Thus, her work is influenced by Eve Sedgwick's argument for a reparative critical approach. With the initial survey results, the 2005 update focused on reparative action.