if coupled into a photoresponsive system with an elastin-like polypeptide, wherein p-(phenylazo)phenylalanine acts as a light-sensitive switch. Alpha-Cyclodextrin promotes a tunable offset, gain, and inversion of the photoresponse, and allows operation of micromachines at body or room temperature. (J. C. Rodríguez-Cabello et al., August 16, Adv. Mater. 2002, 14, 1151-1154)