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However , the molecular processes underlying their functional capacities to promote a healthy status in the host , as well as those involved in survival , colonization and persistence of bifidobacteria in the gut , are far from being completely understood .
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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:
 None