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"Array of equipment used by a diabetic for taking insulin: test strips (left), uncapped syringe (centre) & insulin (lower right). Of the three test strips, the one on the left has not yet been used; the middle one shows normal blood sugar levels, & the one at the right shows the high blood sugar levels of a diabetic. (white background)" (KEYSTONE/SCIENCE PHOTO LIBRARY/MARTIN DOHRN)