In a RAM 1-3, a data area and a current memory are provided. The invention is directed to flt3-L as an isolated protein, the DNA encoding the flt3-L, host cells transfected with cDNAs encoding flt3-L, compositions comprising flt3-L, methods of improving gene transfer to a mammal using flt3-L, and methods of improving transplantations using fit3-L. The connecting section is configured to be connected to and disconnected from the electrical system. A cannula may have filters of various configurations encircling the distal region of the cannula, which prevent embolitic material from entering the coronary arteries and aorta. A user configuration device selects the values for the stored configuration information.