Avery's isolation of the "Transforming Principle"

    Oswald Avery repeated Griffith's experiment of combining heat-killed virulent S bacteria with non-virulent R bacteria. As a chemist, in order to isolate the transforming substance, Avery fractionated the heat-killed S cells and selectively removed carbohydrates and lipids, leaving behind proteins and nucleic acids.

All text material ©2015 by Steven M. Carr