Methods and apparatus are provided for making a rotor blade spar from composite material wherein a multi-component mandrel is used to form the composite spar. Further, the image forming apparatus may include a removing unit configured to remove the mark conveyed by the conveyor member, from the conveyor member; and a control device. The magnets include a first magnet and a second magnet that exert magnetic forces so that the work piece engaging surface magnetically attracts and holds first and second rows of work pieces, the first row being distal from the second row by a row separation distance. The invention also comprises proteins prepared using misarminoacylated tRNAs which can be utilized in pharmaceutical compositions for the treatment of diseases and disorders in humans and other mammals, and kits which may be used for the detection of diseases and disorders.