Avery's Expirement (22 h 13 m, 1 ene 1940 año – 8 h 20 m, 31 dic 1949 año)
Descripción:
 Found that a pure extract of the "transforming principle" was unaffected by treatment with protein-digesting enzymes but was destroyed by a DNA-digesting enzyme. This showed that the transforming principle is DNA and by extension, a gene is made of DNA. 
Añadido al timeline:
fecha:
22 h 13 m, 1 ene 1940 año
8 h 20 m, 31 dic 1949 año
 ~ 10 years