The present invention provides peptide derivatives with a specific affinity for glycosaminoglycan molecules. The method involves contacting the metallic cord with a naphthenic oil containing from 1 to 53 percent by weight of a soluble cobalt salt and thereby deposit from 0. The partially reflective optical coating comprises a relief profile such that, in use, the optical diffuser structure diffuses light in reflection from the partially reflective optical coating and delivers substantially no optical deflection in transmission. The aspects represented by the three or more icons in the collection are encompassed within the aspect represented by the first icon, the three or more icons arranged generally around the first icon on the touch screen.