Manganese chloride (tetrahydrate), molecular biology grade,99.0% (KT) is an orally active and a blood-brain barrier penetrant compound. It affects the activities of multiple enzymes in cells, such as regulating the activities of histone acetyltransferase (HAT) and histone deacetylase (HDAC), thereby affecting gene expression. It has multiple activities such as neurotoxicity, embryotoxicity, and reproductive toxicity. It is currently mainly used in neurodegenerative diseases and toxicology research.