What did Oswald Avery and colleagues identify as the "transforming principle" that changed the pneumococcus R strain into the S strain that causes pneumonia?

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Oswald Avery and his colleagues identified DNA as the "transforming principle" that could change the non-virulent R strain of pneumococcus into the virulent S strain, demonstrating that DNA carries genetic information.

What Did Oswald Avery and Colleagues Identify as the "Transforming