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The importance of these structural units for PSP activity was confirmed by high PSP activity observed in two novel dPGM - like proteins from Cyanobacteria and Chloroflexus in which the two structural units were conserved .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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