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In this brief article, Szent-Gyorgyi announced that he and his research team at Szeged had discovered how muscles contract: two proteins, myosin and actin, form a protein complex, actomyosin, that will contract when combined with magnesium chloride and ATP. Several years later, the Szeged group would publish a collection of very detailed reports titled "Studies on Muscle."
Periodical. Szent-Gyorgyi, Albert. "Das kontraktile Element des Muskels [The contractile element of muscles]." Berichte der Deutschen Chemischen Gesellschaft 75, (1942): 1868-1870. Article. 3 Images.. Berichte der Deutschen Chemischen Gesellschaft