Figure 4: A schematic presentation of a generic D-brane construction. A certain number of D-branes, number of D-branes, before taking the decoupling limit. The low energy degrees of freedom can be simply obtained by considering string spectrum. The strings yield the matter content of SYM, the and strings yield the hypermultiplet, and the string sector is nondynamical; i.e., it yields a global symmetry.