S-16 Molecular Toxicology Leaded by Young Scientists -Novel Approaches to the Investigation of Molecular Mechanism in Toxicology-   S16-1. Altered Physiological Response to Trimethyltin in Mice Lacking PACAP   S16-2. Molecular Mechanism Involved in Methylmercury Toxicity   S16-3. Functional Analysis of Hitone Modification Enzymes during Chemically Induced Hepatocarcinogenesis   S16-4. Reliable Safety Assessment Depends on Species Differences in Epigenetic Mechanisms of Gene Regulation   S16-5. The Problem of Species Comparison of Developmental Toxicity: Can We Extrapolate Human Developmental Toxicity Induced by Environmental Chemicals from the Data of Rodents?