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Pharmacologists play an important role in medicine and in science by studying the effects of drugs, chemicals, and other substances on humans, animals, and plants. These highly educated scientists conduct research on living tissues and organs to determine how drugs and other chemicals act at the cellular level. Their results help to discover how drugs and other chemicals should be most effectively used. The study of pharmacology is necessary to standardize drug dosages; analyze chemicals, food additives, poisons, insecticides, and other substances; and identify dangerous substances and harmful levels of controlled chemicals. There are currently 104,280 medical scientists, including pharmacologists, in the United States.