<P>PROBLEM TO BE SOLVED: To provide a sufficient gene therapeutic system for treating Parkinson's disease. <P>SOLUTION: The use of a vector system comprising at least a part of a rabies G protein for transducing a TH positive neuron is provided. The use of the rabies G vector system for transducing to a target site is also provided, wherein the vector system moves to the target site by retrograde transport, and the use of the same may include the step of administration of the vector system to an administration site which is distant from the target site. <P>COPYRIGHT: (C)2009,JPO&INPIT 
VECTOR SYSTEM