Color print advertisement for synthetic methionine and other amino acids manufactured and sold by the Dow Chemical Company for use in pharmaceuticals and medical and nutritional research. The advertisement features an illustration of a white lab rat standing amongst several beakers and pieces of laboratory glassware, with accompanying text detailing the use of lab rats in experimental research to establish the nutritional value of methionine. The text goes on to discuss Dow's efforts to meet the growing demand for methionine and other amino acids from pharmaceutical and medical professionals.