A method of authenticating a caller and authorizing a callee in a user-device environment may include receiving, by a gateway, a logon request comprising information associated with a caller and determining whether the caller is a subscriber based on at least a portion of the received caller information. Representative examples of anti-angiogenic factors include Anti-Invasive Factor, Retinoic acids and derivatives thereof, and taxol. A plurality of conductive lines arranged as word lines which can be coupled to row decoders, extends orthogonally over the plurality of ridge-shaped stacks. The recesses are shaped and arranged to separate the magnets from each other and maintain a consistent spacing between them.