S-37 Aiming at the Execution of Exploratory Investigational New Drug (IND) Studies: Integration of Science, Ethics and Regulation   S37-1. Towards the Infrastructure Establishment for Microdose Studies   S37-2. Necessity of Microdosing Test and Its Application to New Drug Development   S37-3. Present Aspects of Single Microdose and Preclinical Studies   S37-4. New Era of Drug Development: Ethics, Regulations, and Policy Development   S37-5. Efforts by JPMA to Implement the Exploratory Clinical Trials in Japan   S37-6. From the Viewpoint of Regulatory Authorities