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Sly, chairman of the Department of Biochemistry at St. Louis University Medical Center and a former postdoctoral student in Nirenberg's laboratory, thanks Nirenberg for the opportunity he provided to him. Having recently attended a symposium in Nirenberg's honor where another great scientist and former Nirenberg postdoc, Phil Leder, also attended, Sly writes, "I will always be grateful to you for that opportunity to work in your laboratory, to learn a new direction, and a new way of thinking about problems."