Once researchers learn more about a particular disease, animals are used to develop and test these potential therapies as part of the applied research process. For example, medicines for Parkinson's disease have been developed using animal models with induced Parkinson's-like symptoms. Models such as these are an essential part of applying biological research to real medical problems, allowing new targets for disease intervention to be identified. Data from animal studies is essential before new therapeutic techniques and surgical procedures can be tested on human patients.