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An extracellular material that was capable of passing through a 0.2-μm filter was found to be able to change pigment expression from pigment negative to pigment positive in species other than S. marcescens. The material was possibly

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An extracellular material that was capable of passing through a 0.2-μm filter was found to be able to change pigment expression from pigment negative to pigment positive in species other than S. marcescens. The material was possibly






 
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