Abstract
Summary
Antigen was recovered from Type I Pneumococcus immune precipitate from which some antibody had been removed by treatment with acid. This experiment substantiates our previous finding that the recovery of antibody from immune precipitate by the action of acid or alkali is due to a shift in the antigen-antibody equilibrium. The present finding also suggests a possible method for the isolation of pure antigen which may be useful when it cannot be obtained otherwise.
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