Orce of protein folding is taken to be hydrophobic interactions. The polar side chains are usually directed toward and interact with water, whereas the hydrophobic core of the folded protein consists of nonpolar side chains. A number of studies have been performed using off-lattice models of proteins as well (Emberly et al., 2002; Miller et al., 2002; Hao-Jun and Yuan-Yuan, 2002). The designabilit