Crick met the theoretical physicist and Nobel Laureate Igor Tamm at the Third International Congress of Biochemistry in Moscow in August 1961, and credited him with helping to free biology in the Soviet Union from the influence of Trofim Lysenko, who had held that heredity is not based on chromosomes or genes and that acquired characteristics can be passed on to offspring. In his letter Tamm declared that he was "very proud to be the first person in my country who began to lecture on your theory [of DNA and the genetic code] in 1956."
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