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South American llamas help chemists from University of Washington create convenient tests to determine the caffeine content in coffee. Many coffee lovers do not want to use caffeine for medical reasons, yet until now there was no convenient way of checking it. All test substances decomposed in the 90 degrees (Centigrade) hot drink. Stable to heat anti-bodies linking to caffeine molecules were extracted from the blood of llamas, which have been previously made an injection of caffeine. Now only one small thing is to be done: to develop and to start production of test strips that will change their colour at the presence of caffeine in the drink.