Oswald Avery was interested by what Frederick Griffith had discovered so they and his colleagues found a way to extract the heat-killed disease carrying cells.
In 1944, they had reported that DNA, not proteins (which was believed at the time), was the hereditary substance in these extracts. They backed there document up by the results of an experiment in which they added protein-digesting enzymes to a quantity of the extracts, and the cells were still transformed, but when the added an enzyme that broke the DNA but not the protein, the hereditary transformation was blocked.
In 1944, they had reported that DNA, not proteins (which was believed at the time), was the hereditary substance in these extracts. They backed there document up by the results of an experiment in which they added protein-digesting enzymes to a quantity of the extracts, and the cells were still transformed, but when the added an enzyme that broke the DNA but not the protein, the hereditary transformation was blocked.
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