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The small monomeric GTP - binding proteins of the RAB subfamily are key regulatory elements of the machinery that controls membrane traffic in eukaryotic cells .
 small monomeric GTP - binding proteins, RAB subfamily
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 small monomeric GTP - binding proteins, RAB subfamily