The present invention generally relates to injectible polyisobutylene polymer compounds. The polishing pad has a covering layer with a polishing surface and a backing layer which is adjacent to the platen. Accordingly, using a separate light source, from which a ray of light is emitted with a light axis at a predetermined range of incident angle, acquired fingerprint image is compared and it is determined whether the fingerprint image corresponds to authentic fingerprint or forged one. analysing the system for the presence of one or more cytokines released after exposing the co-culture system to said test agent, and d.