Interleukin-10 for producing a population of cells which are capable of inhibiting or suppressing reactions to alloantigens, for example in graft-versus-host disease or tissue rejection, is described. A second signal is combined with a power signal to form a combination signal, the power signal including a first power usage by the data processing system and a second power usage by a modulating signal. A population inversion of Er is optimized so that a gain variation in the C-band becomes minimum, by the irradiation of the pumping light. The micro-structures are a backbone that restores the liquid crystal director field that existed during the polymerization process even when other factors, such as electric field, temperature, or surface anchoring, do not favor this restoration.