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The family of Rab / Ypt GTPases is intimately involved in vesicular trafficking in yeast and serves as a model for the much larger group of analogous human proteins , the Rab protein family , with more than 60 members .
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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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