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In preliminary experiments designed to isolate pure erythrogenic toxin from streptococcal filtrates, extraneous products were encountered which complicated the separation. In this paper, five such products-a peptone polysaccharide, a uronic acid polysaccharide, a yellow "oil," syrupy proteins, and a "nucleoprotein" fraction-are to be discussed in sequence. The results are presented in some detail because they seem to be of value to the bacteriologist and the biochemist. In this study, culturesdoi:10.1128/jb.38.5.511-524.1939 fatcat:2fqouorsivdmxftm6ol4xrspe4