Medicinal preparations for the diagnosis, treatment or prevention of Central Nervous System diseases, Liver diseases, Neuromuscular diseases and Cardiovascular diseases; Viral systems, gene therapy systems, nucleic acid delivery systems, viral vectors, non-viral vectors, gene therapy vectors, nucleic acid delivery vectors, and cells transformed by viral vectors, non-viral vectors, gene therapy vectors or nucleic acid delivery vectors for medical purposes, namely, drug delivery agents consisti...