A Comparison of the Protein Composition of Three Species of Amoebae*

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Abstract
SYNOPSIS. A comparison has been made of the characteristics of proteins present in two strains of Amoeba proteus, Amoeba discoides, and Chaos chaos. Extractable protein mixtures of each of the strains have been compared with respect to electrophoretic mobilities, enzyme activities, and immunological reactivities. With one slight exception, the three Amoeba strains appear to be identical by all the tests that have been performed but each of the three strains is dearly different from C. chaos by the same tests. The exception may be a difference of a single immunologically active component between A. discoides and one of the A. proteus strains, according to a preliminary observation.