A vehicle navigation system includes a road-between-guidance-target-points configuration determining unit for determining a configuration of a road between two successive guidance target points whose information is extracted from information stored in a guidance target point storing unit. The print assembly includes a plurality of printhead modules each having a printhead integrated circuit. The at least one cooperation area is defined by at least two base stations, each including at least one antenna, wherein each base station has at least one beam. This invention provides an isolated vertebrate nucleic acid molecule of bcl-6 operatively linked to a promoter of RNA transcription. The board body of the other tool assembly is detachably fitted into the passage of the main body and connected with the foldable tool assembly.