A modified virus that is used as a vehicle to deliver genetic material — such as a working gene — directly into a cell's genetic code. They are used in many gene therapies, some vaccines and in basic research Aims to improve scientific theories for a better understanding and prediction of natural phenomena. Discoveries made through basic research can advance our understanding of processes that underlie the development and function of living organisms. Better understanding of how things work sometimes leads to breakthroughs in disease research and treatment. basic research Aims to improve scientific theories for a better understanding and prediction of natural phenomena. Discoveries made through basic research can advance our understanding of processes that underlie the development and function of living organisms. Better understanding of how things work sometimes leads to breakthroughs in disease research and treatment..