The<unk> is a scientific concept developed by a German Nobel laureate Paul Ehrlich in 1907. While working at the Institute of Experimental Therapy (Institut für experimentelle Therapie), Ehrlich formed an idea that it could be possible to kill specific microbes (such as bacteria), which cause diseases in the body, without harming the body itself. He named the hypothetical agent as Zauberkugel, and used the English translation<unk><unk> " in The Harben Lectures at London. Ehrlich envisioned that just like a<unk>  fired from a gun to hit a specific target, there could be a way to specifically target invading microbes. His continued research to discover the<unk> resulted in further knowledge of the functions of the body's immune system, and in the development of Salvarsan, the first effective drug for syphilis, in 1909. His works were the foundation of immunology, and for his contributions he shared the 1908 Nobel Prize in Physiology or Medicine with Élie Metchnikoff. Ehrlich's discovery of Salvarsan in 1909 for the treatment of syphilis is termed as the first<unk>  This led to the foundation of the concept of chemotherapy.
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