Growth differentiation factor, Lefty-2, is disclosed along with its polynucleotide sequence and amino acid sequence. Cache lines may be dynamically allocated and deallocated for inclusion in the dedicated local storage. Therefore, the electronic component supplying unit and the board holding unit are defined as a range to be transported, and the mounting head, the first camera, and the second camera are relatively traveled in conjunction to each other, a loss-time in both the electronic component supplying unit and the board holding unit can be avoided, and tact time can be shortened to improve a work-efficiency. The adaptation of the controller does not require substantial modification of the goal elaborator for its application to the new system or environment.