 Furthermore, when necessary, the activity in response towards outer stimuli (photo-irradiation, pH change, electric or magnetic field, and others) can be provided by using appropriate functional groups.In a molecular imprinting processes, one needs a 1) template, 2) functional monomer(s) 3) cross-linker, 4) radical or other polymerization initiator, 5) porogenic solvent and 6) extraction solvent.According to polymerization method and final polymer format one or some of the reagent can be avoided.