The fact that peroxide formed and accumulated in cultural fluids in which pneumococcus grew led to this series of articles from 1923 to 1925 on certain oxidation-reduction phenomena of the pneumococcus cell. For their research, Avery and Neill utilized sterile extracts of pneumococci in order to obtain information that was relatively uncomplicated by the presence of cell growth. This is one of eight articles reporting on specific results of the research which used two types of cell extracts that were prepared from "unwashed" or "washed" bacteria concentrates.
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