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Summary: Material from a strain of Bacillus subtilis which causes haemolysis was investigated. A fraction possessing the solubility properties of an organic acid appeared to be responsible for the haemolytic activity of the organism, but in the culture filtrate this material was associated with protein which modified its solubility properties considerably. Similar material was found in the culture filtrates of other haemolytic aerobic sporing bacilli.
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Gareth R. Williams (1957) studied this question.
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