A composition that expands or contracts upon a change in exposure to light energy is provided that comprises a protein or protein-based polymeric material having an inverse temperature transition in the range of liquid water, wherein at least a fraction of the monomers in the polymer contain an light...http://www.google.es/patents/US20030166840?utm_source=gb-gplus-sharePatente US20030166840 - PHOTORESPONSIVE POLYMERS
